Math Problem Solver

67. A sample of 25 employees has mean email time 51.05 minutes with standard deviation 4.42 minutes. To test if mean > 50 minutes at α = 0.05, the critical value (t) with df = 24 is:

• A) 1.645

• B) 1.711

• C) 1.96

• D) 2.064

68. For the email test in question 67, the computed test statistic is approximately:

• A) 1.05

• B) 1.19

• C) 2.11

• D) 2.50