Mathematics, 05.07.2019 20:30 sugeilochoa
The manager of a supermarket would like the variance of the waiting times of the customers not to exceed 3 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 28 customer waiting times, she computes the sample variance as 4.2 minutes-squared. she believes that the waiting times are normally distributed. a. select the null and the alternative hypotheses to test if the threshold has been crossed. h0: σ2 ≤ 3; ha: σ2 > 3h0: σ2 = 3; ha: σ2 ≠3h0: σ2 ≥ 3; ha: σ2 < 3 b-1.calculate the value of the test statistic. (round your answer to 2 decimal places.) test statistic b-2.approximate the p-value. p-value < 0.050.05 < p-value < 0.100.10 < p-value < 0.20p-value > 0.20b-3.do you reject the null hypothesis at the 5% level? yes, since the p-value is less than α.no, since the p-value is less than α.yes, since the p-value is more than α.no, since the p-value is more than α. c-1.calculate the critical value at the 5% significance level. (round your answer to 3 decimal places.) critical value d. is action required from the manager? yes, since the value of the test statistic is less than the critical value. no, since the value of the test statistic is less than the critical value. yes, since the value of the test statistic is more than the critical value. no, since the value of the test statistic is more than the critical value.
Answers: 2
Mathematics, 21.06.2019 15:30
The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y
Answers: 1
Mathematics, 21.06.2019 18:40
This stem-and-leaf plot represents the heights of the students on ralph's basketball team. one student's height is missing from the plot. if the mean height of all the students on the team is 61 inches, what is the missing height? a. 55 in. b. 59 in. c. 61 in. d. 65 in.
Answers: 2
The manager of a supermarket would like the variance of the waiting times of the customers not to ex...
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