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#1 Unit 6 Quiz
You wk for a consumer advocate agency and want to find the mean repair cost of a washing machine. As part of your study, you randomly select 55 repair costs and find the mean to be $110. The sample standard deviation is $19.70.
a. 90% of the mean confidence interval for the population of mean repair cost.
the 90% interval confidence is _____ , ______ (Round to two decimal places as needed).
b. Compare the amount of information the different sample sizes give about the population.
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- Posted on Sep 06, 2010 at 5:35:46PM
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