A Researcher Estimated an Unknown Population Standard Deviation to Be

Multiple Choice

A researcher estimated an unknown population standard deviation to be 150.Using a sample of size n = 135,the sample standard deviation was found to be 100.The researcher now wishes to establish a 95% confidence interval for the population mean.Which of the following is the correct standard error of the mean to use in calculating the desired confidence interval?

A) Can't be determined from the information given.
B) 1.05
C) 12.91
D) 0.86
E) 8.61