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CSUF ISDS 361A Practice Exam 2 Version B Skordi Questions and Answers, Exams of Business Economics
CSUF ISDS 361A Practice Exam 2 Version B Skordi Questions and Answers 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. ANSWER✓✓ 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 ANSWER✓✓ SE= sigma/sqrt (n) n 18 mean 27.5 sigma 2.3 d. 0.54 The critical value (CV) used for a 99% interval estimate is
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