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

question 50

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

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