minutes to charge a standard electric vehicle EV battery A
Last updated: 5/24/2023
minutes to charge a standard electric vehicle EV battery A firmware update for this type of supercharger was recently released but the update has received negative reviews from users A researcher suspects the mean time the updated superchargers take to charge a standard EV battery is greater than 13 8 minutes To test his claim he chooses 23 of the updated superchargers at random and measures the time it takes each one to charge a standard EV battery He finds that the superchargers take a sample mean of 14 1 minutes to charge a standard EV battery with a sample standard deviation of 3 3 minutes Assume that the population of amounts of time to charge a standard EV battery using the updated superchargers is approximately normally distributed Complete the parts below to perform a hypothesis test to see if there is enough evidence at the 0 10 level of significance to support the claim that the mean time the updated superchargers take to charge a standard EV battery is more than 13 8 minutes a State the null hypothesis H and the alternative hypothesis that you would use for the test Ho H 0 Student s t Distribution Step 1 Enter the number of degrees of freedom Step 2 Select one tailed or two tailed O One tailed OTwo tailed Step 3 Enter the test statistic Round to 3 decimal places 0 0 Step 4 Shade the area represented by the p value Step 5 Enter the p value Round to 3 decimal places x X b Perform a test and find the p value Here is some information to help you with your test OSO The value of the test statistic is given by 020 0 0 0 0 O The p value is the area under the curve to the right of the value of the test statistic 0 3 054 S 01 c Based on your answer to part b choose what can be concluded at the 0 10 level of significance about the claim made by the researcher Since the p value is less than or equal to the level of significance the null hypothesis is rejected So there is enough evidence to support the claim that the mean time the updated superchargers take to charge a standard EV battery is more than 13 8 minutes Since the p value is less than or equal to the level of significance the null hypothesis is not rejected So there is not enough evidence to support the claim that the mean time the updated superchargers take to charge a standard EV battery is more than 13 8 minutes Since the p value is greater than the level of significance the null hypothesis is rejected So there is enough evidence to support the claim that the mean time the updated superchargers take to charge a standard EV battery is more than 13 8 minutes Since the p value is greater than the level of significance the null hypothesis is not rejected So there is not enough evidence to support the claim that the mean time the updated superchargers take to charge a standard EV battery is more than 13 8 X 5