4
QuizMultiple Choice

Statistical Inferences

Question 4 of 10 • AA - F26 Advanced Algebra

A simple random sample of 90 is drawn from a normally distributed population, and the mean is found to be 138, with a standard deviation of 34. What is the 90% confidence interval for the population mean? Use the table below to help you answer the question.Confidence Level90%95%99%z*-score1.6451.962.58Remember, the margin of error, ME, can be determined using the formula .

Question illustration
Answer
A
128.75 to 147.25
B
130.98 to 145.02
C
132.10 to 143.90
D
137.38 to 138.62
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