Refer to the previous exercise. Instead of 49, suppose that 64 Americans were surveyed about their weekly
Question:
Refer to the previous exercise. Instead of 49, suppose that 64 Americans were surveyed about their weekly expenditures on coffee. Assume the sample mean remained the same.
a. What is the 95% confidence interval estimate of μ?
b. Explain why this confidence interval is narrower than the one determined in the previous exercise.
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a 18775 and 21225 found by b ...View the full answer
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Related Book For 
Statistical Techniques in Business and Economics
ISBN: 978-1259666360
17th edition
Authors: Douglas A. Lind, William G Marchal
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