(Answered)-8.18 The file contains the amount that a sample of nine customers spent for lunch ($) at a fast-food

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8.18 The file contains the amount that a sample of nine customers spent for lunch ($) at a fast-food restaurant a. Construct a 95% confidence interval estimate for the population mean amount spent for lunch ($) at a fast-food restaurant, assuming a normal distribution. b. Interpret the interval constructed in (a). 4.20 5.03 5.86 6.45 7.38 7.54 8.46 8.47 9.87 FastFood n = 18 SELF Test 8.19 The file contains the overall miles per gallon (MPG) of 2010 family sedans. Source: Data extracted from “Vehicle Ratings,” Consumer Reports, April 2010, p. 29. a. Construct a 95% confidence interval estimate for the population mean MPG of 2010 family sedans, assuming a normal distribution. b. Interpret the interval constructed in (a). c. Compare the results in (a) to those in Problem 8.20(a)

 

Solution ID:10137812 | Question answered on 16-Oct-2016

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