The manager of a supermarket would like the variance of the waiting times of the customers not to exceed 2.9 minutes-squared. She would add a new cash register if the variance exceeds this threshold. She regularly checks the waiting times of the customers to ensure that the variance does not rise above the allowed level. In a recent random sample of 25 customer waiting times, she computes the sample variance as 4.2 minutes-squared. She believes that the waiting times are normally distributed. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Select the null and the alternative hypotheses to test if the threshold has been crossed. He: of s 2.9; HA: o2 > 2.9 He: o2 - 2.9; HA: o2 * 2.9 He: of 2 2.9; HA: o2 « 2.9 b-1. Calçulate the value of the test statistic. (Round intermediate calculations to at least 4 decimal places and final answer to 2 decimal places.) Test statistic b-2. Find the p-value. O p-value < 0.01 O 0.025 Picture p-value < 0.05 O 0.01 Picture p-value < 0.025 O 0.05 Picture p-value < 0.10
The manager of a supermarket would like the variance of the waiting times of the customers not to exceed 2.9 minutes-squared. She would add a new cash register if the variance exceeds this threshold. She regularly checks the waiting times of the customers to ensure that the variance does not rise above the allowed level. In a recent random sample of 25 customer waiting times, she computes the sample variance as 4.2 minutes-squared. She believes that the waiting times are normally distributed. (You may find it useful to reference the appropriate table: chi-square table or F table) a. Select the null and the alternative hypotheses to test if the threshold has been crossed. He: of s 2.9; HA: o2 > 2.9 He: o2 - 2.9; HA: o2 * 2.9 He: of 2 2.9; HA: o2 « 2.9 b-1. Calçulate the value of the test statistic. (Round intermediate calculations to at least 4 decimal places and final answer to 2 decimal places.) Test statistic b-2. Find the p-value. O p-value < 0.01 O 0.025 Picture p-value < 0.05 O 0.01 Picture p-value < 0.025 O 0.05 Picture p-value < 0.10
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
![The manager of a supermarket would like the variance of the waiting times of the customers not to exceed 2.9 minutes-squared. She
would add a new cash register if the variance exceeds this threshold. She regularly checks the waiting times of the customers to
ensure that the variance does not rise above the allowed level. In a recent random sample of 25 customer waiting times, she
computes the sample variance as 4.2 minutes-squared. She believes that the waiting times are normally distributed. (You may find it
useful to reference the appropriate table: chi-square table or F table)
a. Select the null and the alternative hypotheses to test if the threshold has been crossed.
H :
2 < 2.9; HA: o2 > 2.9
Hg:
o2 = 2.9; HA: o2 + 2.9
Hg:
2 2.9; HA: o < 2.9
b-1. Calculate the value of the test statistic. (Round intermediate calculations to at least 4 decimal places and final answer to 2
decimal places.)
Test statistic
b-2. Find the p-value.
O pvalue < 0.01
O 0.025 Picture p-value < 0.05
O 0.01Picture p-value < 0.025
O 0.05 Picture p-value < 0.10
O p-value Picture 0.10](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7e61730b-a7aa-4025-855f-4ebc6960ab48%2F2053e007-e76d-4a2d-9640-35ceaa4cf36c%2Fx6iivp_processed.png&w=3840&q=75)
Transcribed Image Text:The manager of a supermarket would like the variance of the waiting times of the customers not to exceed 2.9 minutes-squared. She
would add a new cash register if the variance exceeds this threshold. She regularly checks the waiting times of the customers to
ensure that the variance does not rise above the allowed level. In a recent random sample of 25 customer waiting times, she
computes the sample variance as 4.2 minutes-squared. She believes that the waiting times are normally distributed. (You may find it
useful to reference the appropriate table: chi-square table or F table)
a. Select the null and the alternative hypotheses to test if the threshold has been crossed.
H :
2 < 2.9; HA: o2 > 2.9
Hg:
o2 = 2.9; HA: o2 + 2.9
Hg:
2 2.9; HA: o < 2.9
b-1. Calculate the value of the test statistic. (Round intermediate calculations to at least 4 decimal places and final answer to 2
decimal places.)
Test statistic
b-2. Find the p-value.
O pvalue < 0.01
O 0.025 Picture p-value < 0.05
O 0.01Picture p-value < 0.025
O 0.05 Picture p-value < 0.10
O p-value Picture 0.10
![b-3. Do you reject the null hypothesis at the 5% significance level?
No, since the p-value is greater than the significance level.
O Yes, since the p-value is less than the significance level.
O No, since the p-value is less than the significance level.
O Yes, since the p-value is greater than the significance level.
c. Is action required from the manager?
O Yes, since we reject the null hypothesis.
O No, since we reject the null hypothesis.
O Yes, since we do not reject the null hypothesis.
O No, since we do not reject the null hypothesis.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7e61730b-a7aa-4025-855f-4ebc6960ab48%2F2053e007-e76d-4a2d-9640-35ceaa4cf36c%2Fdbzbswd_processed.png&w=3840&q=75)
Transcribed Image Text:b-3. Do you reject the null hypothesis at the 5% significance level?
No, since the p-value is greater than the significance level.
O Yes, since the p-value is less than the significance level.
O No, since the p-value is less than the significance level.
O Yes, since the p-value is greater than the significance level.
c. Is action required from the manager?
O Yes, since we reject the null hypothesis.
O No, since we reject the null hypothesis.
O Yes, since we do not reject the null hypothesis.
O No, since we do not reject the null hypothesis.
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