How much does a sleeping bag cost? Let's say you want a sleeping bag that should...

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How much does a sleeping bag cost? Let's say you want a sleepingbag that should keep you warm in temperatures from 20°F to 45°F. Arandom sample of prices ($) for sleeping bags in this temperaturerange is given below. Assume that the population of xvalues has an approximately normal distribution.
35 110 65 90 90 35 30 23 100 110
105 95 105 60 110 120 95 90 60 70
(a) Use a calculator with mean and sample standard deviationkeys to find the sample mean price x and sample standarddeviation s. (Round your answers to two decimalplaces.)
x = $
s = $

(b) Using the given data as representative of the population ofprices of all summer sleeping bags, find a 90% confidence intervalfor the mean price ? of all summer sleeping bags. (Roundyour answers to two decimal places.)
lower limit $
upper limit $

Answer & Explanation Solved by verified expert

3.6 Ratings (432 Votes)

Let X denote the prices for sleeping bagsThe sample size is n 20 The provided sample data along withthe data required to compute the sample mean and samplevariance are shown in thetable See Answer

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