Please help in answering these aor b or true and false questions:

Question 1

Peak expiratory flow (PEF) is a measure of a patients ability to expel air from the lungs. Patients with asthma or other respiratory conditions often have restricted PEF. The mean PEF for children free of asthma is 306. An investigator wants to test whether children with chronic bronchitis have restricted PEF. A sample of 40 children with chronic bronchitis is studied. The mean PEF for this sample is 279 with a standard deviation of 71.

Is there statistical evidence of a lower mean PEF in children with chronic bronchitis? Run the appropriate test for a level of significance = 0.05.

a. Yes, there is statistical evidence at a 0.05 level of significance for a mean PEF less than 306.

b. No, the evidence is not significant at a level of 0.05.

Question 2

The margin of error is always greater than or equal to the standard error.

True

False

Question 3 - If a test is run and p = 0.0356, then we can reject the null hypothesis at a level of significance of 0.01.

True

False