Hypertension is diagnosed if a patient€™s systolic blood pressure exceeds 140 mmHg and diastolic blood pressure exceeds 90 mmHg. 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 and are stored in the HYPER file. Biochemists used these data to establish a benchmark for fasting blood sugar (FBS) and magnesium (MAG) levels in hypertensive patients. The accompanying MINITAB printout gives 90% confidence intervals for the mean fasting blood sugar and mean magnesium level.
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 biochemists increase the confidence level to 95%, what will happen to the width of the intervals?
d. If the biochemists increase the sample of hypertensive patients from 50 to 100, what will likely happen to the width of the intervals?

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90% CI Variable N EBS MAG Mean StDev SE Mean 4.3 93.53, 109.71) 50 101.62 34.13 50 1.94100 0.05607 0.00793 (1.92771, 1.95429)