Question

Incorrect Question 6 0/1 pts Provide an appropriate response. A pharmaceutical company wishes to test a new drug with the expectation of lowering cholesterol levels. Ten subjects are randomly selected and pretested. The results are listed below. The subjects were placed on the drug for a period of 6 months, after which their cholesterol levels were tested again. The results are listed below. (All units are milligrams per deciliter.) Test the company's claim that the drug lowers cholesterol levels. Use a = 0.01. Assume that the distribution is normally distributed. Let the difference, d, equal to the cholesterol after using the drug minus the cholesterol level before using the drug. Which of the following is the correct conclusion? Subject| 1 | 2 3 5 6 Before 195 225 202 195 175 250 235 268 190 240 After 180 220 210 175 170 250 205 250 190 225 4 7 8 9 10 Since the test statisticis -2.75 which corresponds to a P-value greater than a, there is NOT sufficient evidence to support the claim that the drug does lower cholesterol levels. Since the test statistic is 2.75 which corresponds to a P-value greater than a, there is NOT sufficient evidence to support the claim that the drug does lower cholesterol levels. Since the test statistic is 2.75 which corresponds to a P-value less than a, there is sufficient evidence to support the claim that the drug does lower cholesterol levels. Since the test statistic is -2.75 which corresponds to a P-value less than a, there is sufficient evidence to support the claim that the drug does lower cholesterol levels.

Answer 1

Answer:

Given,

sample n = 10

Ho : u2-u1 = 0

Ha : u2-u2 !=0

test statistic t = (x - u)/(s/sqrt(n))

substitute values

= 2.75

degree of freedom = n - 1 = 10 - 1 = 9

alpha = 0.01

Critical value = t(alpha/2 , df) = t(0.01/2 , 9) = 2.8214

P value = 0.022477

= 0.0225

p value > alpha

Here we observe that, test statistic < critical value, so we fail to reject Ho.

So there is no sufficient evidence to support the claim.