Question

value: 3
a randomized comparative experiment tests whether a cholesterol medication lowers the overall blood pressure for male patients. the control group has ten male patients and the treatment group, which receives the medication, has 10 male patients. all patients started with a cholesterol level of 245 mg/dl.
cholesterol in mg/dl
control: 241, 243, 242, 245, 250, 248, 246, 245, 242, 247
treatment: 230, 225, 220, 218, 224, 240, 232, 221, 235, 224
what is the difference in the treatment mean and control mean? round to the nearest tenth.
○ a. -18
○ b. -9.2
○ c. -10
○ d. -24.7

Explanation:

Step1: Calculate control group mean

Sum control values: $241+243+242+245+250+248+246+245+242+247 = 2449$
Mean: $\frac{2449}{10} = 244.9$

Step2: Calculate treatment group mean

Sum treatment values: $230+225+220+218+224+240+232+221+235+224 = 2269$
Mean: $\frac{2269}{10} = 226.9$

Step3: Find mean difference (treatment - control)

Difference: $226.9 - 244.9 = -18.0$

Answer:

a. -18