CSUF ISDS 361A Practice Exam 2 Version B Skordi Questions and Answers Already Passed
The following 5 questions are based on this information. Suppose a random sample of 18 uber drivers was taken, and the average age X¯ of these drivers was found to be 27.5 years. Construct a 99% confidence interval for the mean age (µ) of all drivers. Assume that the age of drivers is normally distributed with a population standard deviation (σ) of 2.3 years. You need to know this for the next five questions The standard error (SE) of X¯ is Select one: a. 0.13 b. 6.48 c. 2.3 d. 0.54 SE= sigma/sqrt (n) n 18mean 27.5 sigma 2.3 d. 0.54 The critical value (CV) used for a 99% interval estimate is Select one: a. 2.58 b. 2.32 c. 0.01 d. 0.005 CV = -NORM.S.INV(0.01/2) a. 2.58 The 99% confidence interval estimate of µ is Select one:a. 27.5 ± 0.54 b. 27.5 ± 1.26 c. 27.5 ± 2.3 d. 27.5 ± 1.39 Interval Estinate = Point estimate +/- ME. ME = CV * SE PE = 27.5 ME =1.39 d. 27.5 ± 1.39 The company claims that average age of drivers is 26.9 years. In light of the sample evidence and at the 1% level of significance, Sel
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