Question

UWW is interested in attracting potential students that are both cash strapped and fond of fast food. As a result Willie Warhawk reports in his recruiting materials that the average cost of a complete fast-food meal in Whitewater is $4.82. Suppose this figure was based on a sample of 27 different establishments and the standard deviation was $0.37. Which of the following is the 95% confidence interval for the population mean cost for all fast-food meals in Whitewater.

Group of answer choices

A)about 4.60≤μ≤5.03

B)about 4.67≤μ≤4.96

C)about 4.73≤μ≤4.90

D)about 4.72≤μ≤4.91

E)about 4.77≤μ≤4.92

Answer 1

Solution : x= $4.82 n=27 S = $ 0.37 confidence level = 95% dfon-1227-1326 "The critical value of t at d= 0.05 ad and df =26.ip te=2.056 C.1=(a - te se, at teman = (4.82 - 2.056 x 0.37 t, 4.82 + 2.056 x 0.370 ' vai ' Tar = (4.82 -0.146, 4•82 +0.146) = (4.674, 4.966) Ĉ (4.67 , 4.96) Hence the correct options is 14.675 M5 4.96) 1

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