## Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education

# Chapter 7 - Confidence Intervals and Sample - Chapter Quiz - Page 409: 13

#### Answer

I am 95% confident that the population average cost of doctor’s visits is between 43.15 and 46.45

#### Work Step by Step

You do not know population standard deviation, so you must use the t interval function on your calculator. X bar : 44.80 Sx: 3.53 n:20 C-Level: .95 43.15 < $\mu$ < 46.45

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