As part of a research program for a new cholesterol drug, Johnson Pharmaceuticals would like to investigate the linear relationship between the ages and LDL (low-density lipoprotein) cholesterol levels of men. The following data set shows the ages and LDL cholesterol levels of seven randomly selected men:

Age Cholesterol Age Cholesterol 23 140 42 160 37 177 31 144 26 155 41 210 32 195

a. Construct a 95% confidence interval to estimate the average LDL cholesterol level of a 30-year-old man.

b. Verify your results with PHStat.

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