1 For the data set below which shows the number of days a

A data set includes weights in grams of 36 Reese s Peanut Butter Cup Miniatures The accompanying Statdisk display shows results from using all 36 weights to test the claim that the sample is from a pop with a mean equal to 8 953 g Test the given claim by using the display provided from Statdisk Use a 0 05 significance level Click the icon to view the Statdisk display Identify the null and alternative hypotheses Ho H H H 8 953 8 953 Type integers or decimals Do not round Identify the test statistic Round to two decimal places as needed

the times to test the claim that the mean of all such wait times is more than 30 minutes the accompanying Excel display is obtained Test the given claim by using the display provided from Excel Use a 0 05 significance level iClick the icon to view the Excel display Identify the null and alternative hypotheses Ho Hy Type integers or decimals Do not round Excel Display Difference 3 t Observed value 0 967 t Critical value 1 686 X

A research center claims that more than 31 of employees in a certain country have changed jobs in the past four years In a random sample of 140 people from that country 49 have changed jobs in the past four years At a 0 10 is there enough evidence to support the center s claim Complete parts a through d below a Identify the claim and state Ho and Ha Identify the claim in this scenario Select the correct choice below and fill in the answer box to complete your choice Type an integer or a decimal Do not round OA The percentage of employees in the country who have changed jobs in the past four years is not OB At most C years of employees in the country have changed jobs in the past four of employees in the country have changed jobs in the past fouryears OD More than years of employees in the country have changed jobs in the past four

A humane society claims that less than 68 of households in a certain country own a pet In a random sample of 600 households in that country 396 say they own a pet At a 0 01 is there enough evidence to support the society s claim Complete parts a through c below a Identify the claim and state Ho and Ha Identify the claim in this scenario Select the correct choice below and fill in the answer box to complete your choice Type an integer or a decimal Do not round O A Less than of households in the country own a pet OB The percentage households in the country that own a pet is not OC of households in the country own a pet O D D More than of households in the country own a pet

In a study of cell phone usage and brain hemispheric dominance an Internet sur was e mailed to 6968 subjects randomly selected from an online group involved ears There were 1333 surveys returned Use a 0 01 significance level to test the claim that the return rate is less than 20 Use the P value method and use the normal distribution as an approximation to the binomial distribution Identify the null hypothesis and alternative hypothesis A Ho p 0 2 H p 0 2 C Ho p 0 2 H p 0 2 E Ho p 0 2 H p 0 2 The test statistic is z Round to two decimal places as needed B Ho p 0 2 H p 0 2 D Ho p 0 2 H p 0 2 OF Ho p 0 2 H p 0 2

K In a newspaper s survey of 453 people 53 said that we should replace passwords with biometric security such as fingerprints The accompanying Statdisk display resulls from a lest of the say that we should replace passwords with biometric security Use the normal distribution as an approximation to the binomial distribution Use the display and a 0 10 significance level to complete parts a through a a Is the test two tailed left tailed or right tailed Choose the correct answer below Oleft tailed two tailed right tailed b What is the test statistic z 1 27 Round to two decimal places as needed c What is the P value P value 0 205 Round to three decimal places as needed d What is the null hypothesis and what do you conclude about it umothoci 0 5 where n denotes the population proportion of people who say that we should replace passwords with biometric security Fail to reject the null hypothesis

Your field experience instructor wants to line up 9 cars for transportation to a grade school Between you and your classmates there are 25 cars available How many different groups of cars are possible different groups

In a newspaper s survey of 453 people 53 said that we should replace passwords wil biometric security such as fingerprints The accompanying Statdisk display results from test of the claim that half of us say that we should replace passwords with biometric sec Use the normal distribution as an approximation to the binomial distribution Use the dis and a 0 10 significance level to complete parts a through e Sample proportion 0 5298013 Test Statistic z 1 2686 Critical z 1 6449 P value 0 2046 a Is the test two tailed left tailed or right tailed Choose the correct answer below left tailed two tailed right tailed b What is the test statistic Z

Estimating the Difference Between Two Means Known Variance a A car manufacturer outsources production of a certain automotive component The company has found a cheaper supplier supplier 2 but wants to make sure that the component is of the same quality The standard deviations in component lifetimes are known to be 1 000 miles and o 1 500 miles respectively 50 components from each supplier are tested and the average lifetime for the new supplier s component is 1 050 miles shorter compared to the original supplier s component that is X X 1 050 Find a 95 confidence interval on the difference in average lifetime between the two populations H

The test statistic of z 1 14 is obtained when testing the claim that p 0 26 This is a right tailed test Using a 0 05 significance level complete parts a and b Click here to view the standard normal distribution table for negative z scores Click here to view the standard normal distribution table for positive z scores a Find the critical value s Select the correct choice below and fill in the answer box es within your choice Round to two decimal places as needed OA There are two critical values the lower critical value is is OB There is one critical value the critical value is and the upper critical valu