The owner of a local nightclub has recently surveyed a random sample of n = 300 customers of the club. She would now like to determine whether or not the mean age of her customers is over 35 . If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. Suppose she found that the sample mean was 35.5 years and the population standard deviation was 5 years. What is the p-value associated with the test statistic?
a. 0.9582
b. 1.7300
c. 0.0418
d. 0.0836
Q. 2Statistical tests that are not very sensitive to errors in assumptions are called parametric tests.
Indicate whether the statement is true or false
Q. 3The rejection region for testing H0: = 100 vs. H1: 100, at the 0.05 level of significance is:
a. z < 0.95
b. z > 1.96
c. z > 1.65
d. z < 2.33
Q. 4Nonparametric tests are methods of inference that make no assumptions whatsoever about the nature of underlying population distributions or their parameters.
Indicate whether the statement is true or false
Q. 5We have created a 95 confidence interval for with the results (10, 25). What conclusion will we make if we test H0: = 26 vs. H1: 26 at = 0.025?
a. Reject H0 in favor of H1
b. Accept H0 in favor of H1
c. Fail to reject H0 in favor of H1
d. We cannot tell from the information given.
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