A Researcher Determines a Sample of Size (N) 100 Is

question 13

Multiple Choice

A researcher determines a sample of size (n) 100 is necessary to estimate a population mean with 95% confidence (z = 2) . The calculation of sample size required that he estimate the population standard deviation since it was unknown, and he estimated it as 150. The 100 observations produced a sample mean and a sample standard deviation
The resulting confidence interval is:

• A) 970 <μ < 1030.
• B) 996 <μ < 1004.
• C) 997 < μ < 1003.
• D) 960 < μ < 1040.
• E) There are two possible confidence intervals.

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