In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 3.8 and a standard deviation of 17.4. Complete parts (a) and (b) below.
(a) What is the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment? The best point estimate is _____ mg/dL.
I suppose you would use the mean but a mean of 3.8 with a standard deviation of 17.4 is pretty strange.
in general this is handy:
http://davidmlane.com/hyperstat/z_table.html
The best point estimate of the population mean net change in LDL cholesterol after the garlic treatment is 3.8 mg/dL.
To determine the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment, we would use the sample mean, which provides an estimate of the population mean.
In this case, the sample mean of the changes in LDL cholesterol is given as 3.8 mg/dL. Therefore, the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment is 3.8 mg/dL.