Question

A simple random sample has a sample size of n=65. Given the population is normally distributed, find the critical value t_a/2 corresponding to a 99% confidence level.

Answer 1

Answer:

2.6549

Step-by-step explanation:

Since the sample size n=65, the degrees of freedom is n-1=65-1=64

The critical value=$\frac{t_{0.01}}{2}=t_{0.005}$

Using the t-table and selecting df=64 and $\alpha=0.01$ since it’s a 2 tail the corresponding t-score is 2.6549

Therefore, the critical value is 2.6549