A researcher hypothesized that children's cholesterol levels may be affected by educating their parents on proper nutrition and exercise. A random sample of 40 families with a child between the ages...

A. What is the correct inferential statistical test that will help you answer this question?Provide a justification for why it is appropriate to use this test.

B)

Extracted text: A researcher hypothesized that children's cholesterol levels may be affected by educating their parents on proper nutrition and exercise. A random sample of 40 families with a child between the ages of 10 to 15 who had been diagnosed with high cholesterol were recruited to participate in the study. All parents were provided with educational information on nutrition and exercise. After following the prescribed program, the child's total cholesterol was measured. The children's (the sample) mean cholesterol level was 185 with a standard deviation of 19.5. Is there significant evidence of that their cholesterol level after this intervention is lower than the population mean of 191?