The cholesterol level of patients who had heart attacks was measured

The cholesterol level of patients who had heart attacks was measured
two days after the heart attack and then again four days after the heart attack. The researchers want to see if the cholesterol level of patients who have heart attacks reduces as the time since their heart attack increases. Data is in following table:
Patient Cholesterol day 2 Cholesterol day 4
1 270 218
2 236 234
3 210 214
4 142 116
5 280 200
6 272 276
7 160 146
8 220 182
9 226 238
10 242 288
11 186 190
12 266 236
13 206 244
14 318 258
15 294 240
16 282 294
17 234 220
18 224 200
19 276 220
20 282 186
21 360 352
22 310 202
23 280 218
24 278 248
25 288 278
26 288 248
27 244 270
28 236 242

Let μ1 = mean cholesterol level of patients who had heart attacks was measured two days after the heart attack. Let μ2 = mean cholesterol level of patients who had heart attacks was measured four days after the heart attack. Which of the following statements correctly defines the null hypothesis HO?
A. μ1 − μ2 > 0 (μd > 0)
B. μ1 – μ2 < 0 (μd < 0)
C. μ1 = μ2 (μd = 0)
D. μ1 + μ2 = 0

Let μ1 = mean cholesterol level of patients who had heart attacks was measured two days after the heart attack. Let μ2 = mean cholesterol level of patients who had heart attacks was measured four days after the heart attack. Which of the following statements correctly defines the alternate hypothesis HA?
A. μ1 − μ2 < 0 (μd < 0)
B. μ1 – μ2 > 0 (μd > 0)
C. μ1 = μ2 (μd = 0)
D. μ1 + μ2 = 0

Determine sample mean of differences xd

Determine sample standard deviation of differences sd

Calculate and enter test statistic



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