Hypothesis testing for the mean of nail length.
The mean age of 25 randomly selected college seniors was found to be 23.5 years, and the standard deviation of all college seniors was 1.3 years. Which of the following is the correct symbol for 1.3 years? A. m B. s C. s D. A machine produces 3-inch nails. A sample of 10 nails was selected and the lengths determine