Statistics Questions and Answers

stion 5 summarizing categorical data counts c data tive proportion tive frequency

estion 3 tatistic is a numerical summ of one individual observation of a sample data set

It currently takes users a mean of company After changes have been minutes so that they can change th takes for them to install the softwa test at the 0 10 level of significance

e at a 0 05 level of significance that the mean delivery time is at a 0 05 level of significance that the mean delivery time is

1 Draw a bar graph that visually represents the data Effect of Human Generated Carbon Emissions on the Cryosphere Atmosphere and Geosphere A Air Temperature C Starting Values 15 Coverage in Snow ice yr 20 y 0 00 0 39 0 01 A Carbon Storage in Atmosphere gigatons 1 yr 4 59 20 yr 91 8 0 29 4 59 91 8 A Carbon Storage in Hydrosphere gigatons 1 yr 0 41 0 41 20 yr 8 25 8 25 A Carbon Storage in Biosphere gigatons 1 yr 1 46 1 46 20 yr 29 2 A Carbon Storage in Geosphere gigatons 29 2 1 yr 0 19 0 19 20 yr 3 75 3 75

1 27 Marriage Rates The number of married people in the United States and the total number of adults in the United States in millions are provided in the accompanying table for several years Find the percentage of people married in each of the given years and describe the trend over time Source 2009 World Almanac and Book of Facts Year 1990 1997 2000 2007 Married 112 6 116 8 120 2 129 9 Total 191 8 207 2 213 8 235 8

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A manufacturer of economy cars has determined that 46 000 cars per month can be sold at a price of 8920 per car At a price of 8670 the number of cars sold per month would increase to 51 000 Determine a linear function that predicts the number of cars that will be sold at a price of x dollars N

Business Weekly conducted a survey of graduates from 30 top MBA programs On the basis of the survey assume the mean annual salary for graduates 10 years after graduation is 138000 dollars Assume the standard deviation is 34000 dollars Suppose you take a simple random sample of 68 graduates Find the probability that a single randomly selected salary is at least 131000 dollars P X 131000 Find the probability that a sample of size n 68 is randomly selected with a mean that is at least 131000 dollars P M 131000 Enter your answers as numbers accurate to 4 decimal places

The heights of ten year old males are normally distributed with a mean of 59 2 inches and a standard deviation of 5 1 inches If a pediatrician selects a random sample of 32 ten year old males from his patient population what is the probability that the mean height of this sample will be greater than 61 inches Round your answer to at least three decimal places

A manufacturer of kitcken appliances is preparing to set the price on a new blender Implement the given model on a spreadsheet and construct a one way data table to estimate the price for which profit is maximized Total Profit 17 480 2518P 3p Find the price that produces the maximum profit on the range from 200 to 700 The manufacturer should set the price on the new blender at Type whole numbers for a maximum profit of

The accompanying table shows the maximum weights in kilog a 10 meter sprint for 12 international soccer players Complete Click here to view the data table Click here to view the table of

aw Hill LLC All Rights Reserved Terms of Use 66 Save For Later A Submit Assi Privacy Center A

Consider the following data set that shows the number of hours a week families in a neighborhood spend watching television 0 7 5 12 10 20 7 8 3 The mode of these data would be digite sua resposta 1 ponto Consider the following data set that shows the number of hours a week families in a neighborhood spend watching television 0 7 5 12 10 20 7 8 3 The median of these data would be D

VIV The accompanying table shows the ages in years of 11 childr Click here to view the data table Click here to view the table of a Display the data in a scatter plot Choose the correct graph OA B

The accompanying table shows the earnings per share through d below

A manufacturer must test that his bolts are 3 00 cm long when they come o After sampling 196 randomly selected bolts off the assembly line he calcula 0 37 cm Assuming a level of significance of 0 02 is there sufficient evidence Step 3 of 3 Draw a conclusion and interpret the decision Answer

1644 Ecology Population p of phytoplankton produce g grams of carbon in d days A nutrient influx then increased p by 5 How many grams of carbon could be produced in d days now Assume a constant rate of grams per phytoplankton population per day ect one gd p 5 P 5d P g p 5 P g p 5 5p

H 4 Let X and Y have independent Poisson distributions with parameters 0 and 0 respec tively Compute P X Y k k 0 1 2 and show that X Y has a Poisson distribution of parameter u Hint Use the binomial theorem

Express the confidence interval 22 8 79 8 in the form of a ME ME 1

The following are ages of 18 of the signers of the Declaration of Independence 50 39 37 60 35 53 63 33 60 34 54 42 50 45 40 50 31 27 Send data to calculator Find 25th 90th percentiles for these ages and a b The 25th percentile The 90th percentile 0

The following are the P E ratios price of stock divided by projected earnings per share for 18 banks 15 50 23 19 24 21 38 18 23 20 23 14 18 29 18 22 20 14 Send data to calculator Find 20th a b and 75th percentiles for these ratios The 20th percentile The 75th percentile

The serum cholesterol levels in a 259 237 203 220 222 249 235 230 252 240 242 232 208 191 206 Send data to calculator b Find 25th and 70th percentiles for these cholesterol levels The 25th The 70th mg percentile of 15 individuals are percentile dL mg dL mg dL

To test Ho 50 versus H 50 a random sample of size n 22 is obtained from a population that is known to be normally distributed Complete parts a through d below Click here to view the t Distribution Area in Right Tail a If x 47 5 and s 10 3 compute the test statistic to 1 138 Round to three decimal places as needed b If the researcher decides to test thi hypothesis at the a 0 05 level of significance determine the critical value s Although technology or a t distribution table can be used to find the critical value in this problem use the t distribution table given Critical Value Round to three decimal places Use a comma to separate answers as needed

In a study researchers wanted to measure the effect of alcohol on the hippocampal region the portion of the brain responsible for long term memory storage in adolescents The researchers randomly selected 17 adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9 02 cm An analysis of the sample data revealed that the hippocampal volume is approximately normal with no outliers and x 8 04 cm and s 0 7 cm Conduct the appropriate test at the a 0 01 level of significance State the null and alternative hypotheses Hoi H Type integers or decimals Do not round

through d below Click here to view the t Distribution Area in Right Tail a If x 47 5 and s 10 3 compute the test statistic to Round to three decimal places as nee t Distribution Area in Right Tail df I 2 3 4 5 6 0 25 1 000 1 376 1 963 0816 1061 1 386 0 765 0 978 1 250 1 190 0 741 0 941 0 727 0 920 1 156 0 718 0 906 1 134 0 20 0 15 0 10 Distribution Area in Right Tail 0 025 0 05 3 078 6 314 12 706 2 920 4 303 1 886 1 638 2 353 3 182 1 533 2 132 2 776 1476 2015 2 571 2447 1440 1 943 0 005 0 0025 63 657 127 321 9 925 14 089 0 01 0 02 15 894 31 821 4 849 6 965 3 482 2 999 4 541 5 841 3 747 4 604 2 757 3 365 4 032 2612 3 143 3 707 7 453 5 598 4 773 4 317 1000

To test Ho 105 versus H 105 a simple random sample of size n 35 is obtained Complete parts a through e below Click here to view the t Distribution Area in Right Tail a Does the population have to be normally distributed to test this hypothesis Why OA No because n 30 B Yes because n 30 OC Yes because the sample is random OD No because the test is two tailed

One year the mean age of an inmate on death row was 38 9 years A sociologist wondered whether the mean age of a death row inmate has changed since then She randomly selects 32 death row inmates and finds that their mean age is 38 1 with a standard deviation of 8 7 Construct a 95 confidence interval about the mean age What does the interval imply Click the icon to view the table of critical t values Choose the correct hypotheses Ho H Tuno intenors or desimale Do not round SLLLS

The fill amount in 1 liter soft drink bottles is normally distributed with a mean of 1 0 liter and a standard deviation of 0 05 liter If bottles contain less than 94 of the listed net content 0 94 liters in this case the manufacturer may be subject to penalty by the state office of consumer affairs Bottles that have a net content above 1 09 liters may cause excess spillage upon opening In an effort to reduce the number of bottles that contain less than 0 94 liter the bottler sets the filling machine so that the mean is 1 02 liters Under these circumstances complete parts a through e below CITE

A wedding website states tha To see if her hope is correct 27 360 Assuming that the level of significance Step 1 of 3 State the null a

Marketers believe that 93 of adults in the United States own a car A car manufacturer believes that number is actually lower 200 American adults are surveyed of which 175 report having cars Use a 5 level of significance 1 State the null and alternative hypothesis Ho p 0 93 Ho p 0 93 Correct Solution

hard copy eBook hard copy hard copy 3 eBook eBook eBook eBook eBook eBook eBook eBook hard copy eBook eBook eBook eBook eBook hard copy eBook eBook eBook hard copy hard copy eBook hard copy hard copy eBook hard copy hard copy Determine the point estimate and the sample standard deviation 8 Round the sample proportion to 8p four decimal places and round the standard deviation to six decimal places if necessary Using a 97 confidence level determine the margin of error E and a confidence interval for the proportion of all students at the college who work prefer eBooks over printed textbooks Report the Confidence interval using interval notation Report the solutions in percent form rounded to two decimal places if necessary The margin of error is given by E 97 confidence interval is given by he margin of error for this confidence interval is quite large What is the best way for the bookstore to chieve a confidence interval with a smaller margin of error Decrease the level of confidence Decrease the sample siz

The Martin County Health Department needs to estimate the proportion of all children in the county aged 19 35 months that are completely up to date with all state recommended immunizations The Martin County Health Department found that 66 of a random sample of children in the county aged 19 35 months were completely up to date with all state recommended immunizations Find three different confidence intervals one with sample size 480 one with sample size 743 and one with sample size 956 Assume that 66 of the children each sample are completely up to date with all state recommended immunizations Notice how the sample size affects the margin of error and the width of the interval Report confidence interval solutions using interval notation Report all solutions in percent form rounded to two decimal places if necessary When n 480 the margin of error for a 96 confidence interval is given by When n 480 a 96 confidence interval is given by When n 743 the margin of error for a 96 confidence interval is given by When n 743 a 96 confidence interval is given by When n 956 the margin of error for a 96 confidence interval is given by When n 956 a 96 confidence interval is given by If the sample size is increased leaving all other characteristics constant the margin of error of the confidence interval will Select an answer If the sample size is increased leaving all other characteristics constant the width of the confidence interval will select an answer

A local non profit group would like to estimate the proportion of residents of Okeechobee county who do not have health insurance Determine the most conservative sample size required to limit the margin of error to within 0 046 of the population proportion for a 90 confidence interval Round the solution up to the nearest whole number

The U S Energy Information Administration claimed that U S residential customers used an a their area use more ele electricity this year A local power company believes that residents average To test their claim the company chooses a random sample of 189 of their custome average of 10 628 kWh of electricity last year Assuming that the population standard devia to support the power company s claim at the 0 02 level of significance Step 3 of 3 Draw a conclusion and interpret the decision Answer We fail to reject the null hypothesis and conclude that there is sufficient e O support the power company s claim that the mean amount of electricity f national average We reject the null hypothesis and conclude that there is insufficient evide support the power company s claim that the mean amount of electricity f national average We reject the null hypothesis and conclude that there is sufficient eviden support the power company s claim that the mean amount of electricity

FINANCIAL ACCOUNTING 9 Itranscript Examine the following selected financial information for Great Buy Corporation and Simply Stores Inc as of the Click the icon to view the financial information Read the requirements 1 Total assets 2 Total Stockholders equity 3 Operating income Interest expense 1 Complete the table calculating all the requested information for the two companies Use year end figures in Round your answers to two decimal places X XX Enter amounts in millions as provided to you in the problem 4 5 Leverage ratio Question 7 of 7 Great Buy Corporation Simply Stores Inc O In millions 16 790 3 085 1 650 93 C 203 120 71 820 26 820 2 030 Data ta 1 Total 2 Total

What does chi square utilize to calculate a correlation coefficient between two categorical variables Frequencies O Rating scale

Ken is conducting a study to determine if there is a significant correlation between two different types of fish More specifically he wants to find out if higher numbers of catfish are associated with higher or lower numbers of guppies These are both categorical variables Which of the following tests could he use O Chi square O ANOVA Linear regression Multiple regression

Which of the following tests is used to identify significant differences between multiple groups O ANOVA O Chi square O Regression Correlation

In a survey 23 people were asked how much they spent on their child s last birthday gift The results were roughly bell shaped with a mean of 49 and standard deviation of 2 Find the margin of error at a 98 confidence level Give your answer to two decimal places ME 1 59 X

Question 1 14 3 points Identify the following numerical values the average height of 10 plants grown with rain water in a study of the effects of all plants grown with rain water O Parameter O Statistic Question 2 14 3 points Identify the following data set a manager of a movie theater was asking customers at the concession stand how they would rate the theater s staff Population MIK

A traffic cop was stopping every 5th car to check for insurance and license What type of sampling method is the cop using Simple Random Sampling Stratified Sampling O Systematic Sampling Convenience Sampling

A recent survey reported that small businesses spend 23 hours a week market small businesses in their area are not growing because these businesses are s chamber conducts a survey of 87 small businesses within their state and finds hours a week Assuming that the population standard deviation is 4 2 hours is commerce s claim at the 0 01 level of significance Step 3 of 3 Draw a conclusion and interpret the decision Answer We reject the null hypothesis and conclude that there is suffici support the chamber s claim that businesses are spending les

You measure 22 backpacks weights and find they have a mean weight of 47 ounces Assume the population standard deviation is 4 6 ounces Based on this what is the margin of error associated with a 90 confidence interval for the true population mean backpack weight Round your answer to two decimal places ME 1 645 Xounces

Tech4U is a technology chain that often offers really great deals on the newest devices Over the last month the corporate office has been tracking the number of new tablets sold at each Tech4U store The histogram below summarizes the data Use the histogram to answer each of the questions Frequency Number of stores 10 9 8 7 6 5 4 3 2 1 0 9 to 19 20 to 30 31 to 41 Number of tablets sold a What is the class width 0 b How many stores sold from 9 to 19 tablets 0 c How many stores sold 20 or more tablets 0 42 to 52 Fips

Several years ago 34 of parents with children in grades K 12 were satisfied with the quality of education the students receive A recent poll found that 454 of 1 185 parents with children in grades K 12 were satisfied with the quality of education the students receive Construct a 90 confidence interval to assess whether this represents evidence that parents attitudes toward the quality of education have changed Click the icon to view the Confidence Interval Critical Value table TOMUTOV VISSIVE A Since the interval contains the proportion stated in the null hypothesis there is sufficient evidence that parents attitudes toward the quality of education have changed OB Since the interval does not contain the proportion stated in the null hypothesis there is sufficient evidence that parents attitudes toward the quality of education have changed OC Since the interval does not contain the proportion stated in the null hypothesis there is insufficient evidence that parents attitudes toward the quality of education have changed D Since the interval contains the proportion stated in the null hypothesis there is insufficient evidence that parents attitudes toward the quality of education have changed

Twenty years ago 46 of parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science A recent survey found that 220 of 750 parents of children in high school felt it was a serious problem that high school students were not being taught enough math and science Do parents feel differently today than they did twenty years ago Use the 0 1 level of significance Because npo 1 Po 10 the sample size is Round to one decimal place as needed 5 of the population size and the sample satisfied the requirements for testing the hypothesis

You intend to draw a random sample of size n 603 from a population whose parameter is p 0 02 What is the mean of the distribution of sample proportions 45 What is the standard deviation of the distribution of sample proportions Report answer accurate to 2 decimal places

I am Malalai Excerpt by Malalai Yousafzia I am a Pashtun a member of a proud tribe of people spread across Afghanistan an Pakistan My father Ziauddin and my mother Toor Pekai are from mountain village but after they married they relocated to Mingora the largest city in the Swat Valley which is in northwest Pakistan where I was born Swat was known for its beauty and tourists came from all over to see its tall mountains lush green hills and crystal clear rivers I m named for the great young Pashtun heroine Malalai who inspired her countryme with her courage But I don t believe in fighting even though my fourteen year old brother Khushal annoys me to no end I don t fight with him Rather he fights with me And I agree wit Newton For every action there is an equal and opposite reaction So I guess you cou say that when Khushal fights with me I oblige him We argue over the TV remote Ove chores Over who s the better student Over who ate the last of the Cheesy Wotsits O whatever you can think of My ten year old brother Atal annoys me less And he is quite good at chasing down cricket ball when we kick it out of bounds But he does make up his own rules sometim 9 The point of view used by the author gives the reader insight into the A family s behaviors B Pashtun tribe narrator s thoughts Obrothers feelings 10 Newton s law is significant because it explains A the relationship Malalai has with her family how Malalai justifies fighting with her brother

Excerpt by Cheryl Strayed The trees were tall but I was taller standing above them on a steep mountain slope in northern California Moments before I d removed my hiking boots and the left one had fallen into those trees first catapulting into the air when my enormous backpack toppled onto it then skittering across the gravelly trail and flying over the edge It bounced off a rocky outcropping several feet beneath me before disappearing into the forest canopy below impossible to retrieve I let out a stunned gasp though I d been in the wilderness thirty eight days and by then I d come to know that anything could happen and that everything would But that doesn t mean I wasn t shocked when it did My boot was gone Actually gone I clutched its mate to my chest like a baby though of course it was futile What is one boot without the other boot It is nothing It is useless an orphan forevermore and I could take no mercy on it It was a big lug of a thing of genuine heft a brown leather boot with a red lace and silver metal fasts I lifted it high and threw it with all my might and watched it fall into the lush trees and out of my life I was alone I was barefoot I was twenty six years old and an orphan too An actual stray a stranger had observed a couple of weeks before when I d told him my name and explained how very loose I was in the world My father left my life when I was six My mother died when I was twenty two In the wake of her death my stepfather morphed from the person I considered my dad into a man I only occasionally recognized My two siblings scattered in their grief in spite of my efforts to hold us together until I gave up and scattered as well 37 In paragraph 4 what led up to her being in this current predicament She lost her mother She did not connect with her family She was upset with her father She was alone A B C 38 The shoes are important in the excerpt because they symbolize the A feeling of loneliness she is dealing with