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Questions 12-14 are related to the following: Assume the student commuting time to the IUPUI campus...

Questions 12-14 are related to the following: Assume the student commuting time to the IUPUI campus is normally distributed. To build a 95% confidence interval for the mean commuting time for all IUPUI students, a random sample of n = 5 students provided the following times (shown in minutes). x 15 12 18 25 30 12 The variance of the mean x̅ is a 54.5 b 45.6 c 10.9 d 8.7 13 The margin or error for a 95% interval estimate is, a 10.3 b 9.17 c 8.89 d 6.47 14 In the previous question to obtain a 95% margin of error of ±2 minutes, what is the minimum sample size? Use for planning value round the standard deviation from the sample data above to the nearest integer. a 60 b 56 c 52 d 48.

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from the given data, we have nan az EM 15+12+ 18+2 5+30 ñ to 5730 - 207 .- (ne)variance (2) Ena E 1947 2032+ ..... +130-2014)

(14) FE2 02=54.5 n = 2 Critical * 2 = (1.96)** 154.5) (212 52.34 - 152 Round to nearest integer 80, the correct option- ①

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