16.A random sample of 100 observations from a population with standard deviation 60 yeilds a sample mean of 110. Test the null hypothesis that H:u=100 versus Ho:u>100 using a =.05

a)z=1.67

b)z=1.69

c)z=1.96

d)z=2.09

12.Using a sample size ofn=400. if a=20 and x=72.5, find the value of the test Statistic. Consider the test Ho:u=70 versus Ha:u >70

a)1.8

b)2.25

c)2.5

d)2.3

9.Find the p-value of the test Ho:u=50 when Ha:: u>50 if a sample n=100 possessed a mean x-49 and a standard deviation s=4.1

a).9522

b).9134

c).9368

d).9279

7.The average lenght of stay at a popular hotel chain is 4.5 days. A random sample of 20 hotels in the chain had a mean lenght of stay 3.8 days and a standard deviation of 1.2 days. Estimate u the mean lenght of stay at all hotels in the chain with 90% confidance.

a)3.9 +.645

b)2.8+.664

c)3.2+464

d)3.8+464

5.Because the popularityof movies as an entertainment medium for adolescents, an entrepreneur plans to do a national study of the average cost of a moive ticket. If you assume that s=$0.50, what sample size would the entrepreneur have to take to be 95% confident that the estimate was within $0.25 of the ture mean ticket price?

a)8

b)4

c)16

d)15