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

Question

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.

Quizplus · Accepted Answer

The Answer of 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.

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