It Has Been Hypothesized That on Average Employees Spend One $\alpha$

Multiple Choice

It has been hypothesized that on average employees spend one hour a day playing video games at work.To test this at her company,a manager takes a random sample of 35 employees who showed a mean time of 55 minutes per day with a standard deviation of 5 minutes.What is the critical value for testing these hypotheses at $\alpha$ = .01.

A) 1.28
B) 1.645
C) 1.96
D) 2.33
E) 2.575