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
treatment	230	225	220	218	224	240	232	221	235	224

what is the mean of the experiment group? round to the nearest tenth.
○ a. 244.9
○ b. 226.9
○ c. 235.7
○ d. 228.3

Explanation:

Step1: Recall mean formula

The mean $\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}$, where $x_{i}$ are the data - points and $n$ is the number of data - points. Here, $n = 10$ for the treatment (experiment) group.

Step2: Calculate the sum of the treatment group data

$230+225+220+218+224+240+232+221+235+224 = 2269$.

Step3: Calculate the mean

$\bar{x}=\frac{2269}{10}=226.9$.

Answer:

B. 226.9