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The manager of a grocery store has taken a random sample of 100 customers. The average...

The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known at 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly different than 3 minutes. Use α = 0.05.

14. The test statistic is

a. 1.96

b. 1.64

c. 2.00

d. 0.056

15. The p-value is

a. 0.0456

b. 0.0482

c. 0.4772

d. 0.9759

e. 0.9772

16. At the 5% level, you

a. fail to reject the null hypothesis

b. reject the null hypothesis

17. Compute the probability of a Type II Error when µ = 2.8.

a. 0.0000

b. 0.0207

c. 0.4793

d. 0.9793

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