Question

Practice for Hypothesis Testing (with z)

3. A bank claims that its customers wait in line for an average of 3 minutes with a standard deviation of 1.4 minutes. You think customers wait for more than three minutes. You sample the waiting times of 26 customers and find a sample mean of 3.5 minutes. Do a hypothesis test using a= 0.02.

4. A college’s admissions guide state that students spend approximately $300 for textbooks each semester. A random sample of 31 college students finds that the sample mean for the amount spent on textbooks is $365. Assume that the standard deviation for the population is $75. Test at the a= .02 level to determine if students spend significantly more than the amount stated in the admission’s guide.

Answer 1

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