Need explanation. How do you identify when to reject and not reject the null hypothesis?

1. When conducting a right-tailed 2 test with a = 0.05, the test value was computed to be 2.07. The decision would be to not reject the null hypothesis. A) True B) False 2. Dr. Christina Cuttleman, a nutritionist, claims that the average number of calories in a serving of popcorn is 85 with a standard deviation of 5. A sample of 100 servings of popcorn was found to have an average of 84 calories. Check Dr. Cuttleman's claim at a = 0.01. A) Do not reject Dr. Cuttleman's claim since the test value -2 falls in noncritical region. B) Reject Dr. Cuttleman's claim since the test value -4 2.58. D) Reject Dr. Cuttleman's claim since the test value -4 falls in critical region. 3. In a particular city, the average annual salary for secretaries is $30,000. A sample of 50 secretaries from Company A shows an average annual salary of $28,000 with a population standard deviation of $3,000. Secretaries at Company A claim they are paid less than the city average. What is the test value for this claim? A) -9.56 B) 5.51 C) -4.71 D) 15.92