Question 21 (1 point) Question 21 Unsaved A new drug to treat high cholesterol i

Question

Question 21 (1 point) Question 21 Unsaved A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels for 24 patients were recorded before administering the drug and after. The mean difference in total cholesterol levels (after - before) was -19.723 mg/dL with a standard deviation of 9.661 mg/dL. When creating a 90% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error? Question 21 options: 1) 0.7283 2) 3.3798 3) 2.5988 4) 3.3739 5) 1.972

Explanation / Answer

Q.21

margin of error = Critical Test statistic * standard error of staitistic

Critical test statistic is for alpha = 0.1 and one tailed test for dF = 23

tcritical = 1.319

so standard error of statistic = s/ n = 9.661/ 24 = 1.972

so Margin of error = 1.319 * 1.972 = 2.601

so option C is correct here.

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