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A student records the repair cost for 13 randomly selected TVs. A sample mean of $72.19...

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Basic Math

A student records the repair cost for 13 randomlyselected TVs. A sample mean of $72.19 and standard deviation of$15.88 are subsequently computed. Determine the 98% confidenceinterval for the mean repair cost for the TVs. Assume thepopulation is approximately normal.

1) Find the critical value that should be used inconstructing the confidence interval. Round you answer to threedecimal places.

2) Construct the 98% confidence interval. Round youranswer to two decimal places.

Answer & Explanation Solved by verified expert
3.9 Ratings (480 Votes)
Answer aThe number of degrees of freedom are df    See Answer
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