Question

1. An investigator hypothesizes that cholesterol levels in children might be affected by educating their parents on proper nutrition and exercise. A sample of 40 families with a child between the ages of 10-15 who has been diagnosed with high cholesterol agree to participate in the study. All parents are provided educational information on nutrition and exercise. After following the prescribed program, their child's total cholesterol level is measured. The children's mean cholesterol level is 175 with a standard deviation of 19.3. Is there significant evidence of a reduction in total cholesterol in the children? The Z test p-value is 0.0674. The initial children's mean total cholesterol level was 180.

Answer 1

To test null hypothesis
Ho :μ = 180
against alternative hypothesis
H, :μ180

Since P-value = 0.0674 > 0.05,so at 5% level of significance, we fail to reject the null hypothesis and we can conclude that the mean cholesterol level is not significantly different from 180.