Lipid profiles of hypertensive patients. People with high blood pressure suffer from hypertension. A study of the lipid profiles of hypertensive patients was carried out and the results published in Biology and Medicine (Vol. 2, 2010). Data on fasting blood sugar (milligrams/deciliter)

and magnesium (milligrams/deciliter) in blood specimens collected from 50 patients diagnosed with hypertension were collected. The accompanying MINITAB printout gives 90% confidence intervals for the mean fasting blood sugar (FBS) and mean magnesium level (MAG).

a. Locate and interpret the 90% confidence interval for mean fasting blood sugar on the printout.

b. Locate and interpret the 90% confidence interval for mean magnesium level on the printout.

c. If the confidence level is increased to 95%, what will happen to the width of the intervals?

d. If the sample of hypertensive patients is increased from 50 to 100, what will likely happen to the width of the intervals?

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Variable N FBS MAG 50 Mean 101.62 StDev SE Mean 34.13 4.83 50 1.94100 0.05607 0.00793 90% CI ( 93.53, 109.71) (1.92771, 1.95429)