
Concept explainers
In Problems 13-19. assumethat the population of x values has an approximately
Camping: Cost of a Sleeping Bag How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from
80 | 90 | 100 | 120 | 75 | 37 | 30 | 23 | 100 | no |
105 | 95 | 105 | 60 | no | 120 | 95 | 90 | 60 | 70 |
(a) Use a calculator with
(b) Using the given data as representative of the population of prices of all summer sleeping bags, find a 90% confidence interval for the mean price µ of all summer sleeping bags.
(c) Interpretation What does the confidence interval mean in the context of this problem?

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Chapter 8 Solutions
Understanding Basic Statistics
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