The Cell Tone Company sells cellular phones and airtime in several northwestern states. At a recent meeting,
Question:
a. Based on the statement made by the marketing manager, formulate the appropriate null and alternative hypotheses.
b. The marketing manager must support his statement concerning average customer age in an upcoming board meeting. Using a significance level of 0.10, provide this support for the marketing manager.
c. Consider the result of the hypothesis test you conducted in part b. Which of the two types of hypothesis-test errors could you have committed? How could you discover if you had, indeed, made this error?
d. Calculate the critical value, α.
e. Determine the p -value and conduct the test using the p -value approach.
f. Note that the sample data list the customer’s age to the nearest year. (1) If we denote a randomly selected customer’s age (to the nearest year) as xi, is xi a continuous or discrete random variable? (2) Is it possible that xi has a normal distribution? Consider your answers to (1) and (2) and the fact that x must have a normal distribution to facilitate the calculation in part b. Does this mean that the calculation you have performed in part b is inappropriate? Explain your answer.
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Related Book For
Business Statistics A Decision Making Approach
ISBN: 9780133021844
9th Edition
Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry
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