Ten couples are participating in a small study on cholesterol. Neither the man nor the woman in each couple is known to have any problems with high cholesterol. The researcher conducting the study wishes to use a hypothesis test for matched pairs to determine if there is evidence that the cholesterol level for the husband tends to be higher than the cholesterol level for the wife. The cholesterol measurements for the ten couples are given below:. Couple
1
2
3
4
5
6
7
8
9
10
Husband’s cholesterol
224
310
266
332
244
178
280
276
242
260
Wife’s cholesterol
200
270
288
296
270
180
268
244
210
236
a. The researcher conducting a test wishes to determine if there is evidence that the cholesterol level for the husband tends to be higher than the cholesterol level for the wife.
b. Why do you use the test above for part a?