The data in the table below are a sample of cholesterol levels taken from 24 hospital employees who were on a standard American diet and who agreed to adopt a vegetarian diet for 1 month. Serum-cholesterol measurements were made before adopting the diet and 1 month after. The data are available at cholesterol.xls at www.cengagebrain.com.

Serum-cholesterol levels $(\mathrm{m}\mathrm{g}\mathrm{/}\mathrm{d}\mathrm{L})$(mg/dL) before and after adopting a vegetarian diet

Subject	Before	After	Difference*
1	195	146	49
2	145	155	$-10$−10
3	205	178	27
4	159	146	13
5	244	208	36
6	166	147	19
7	250	202	48
8	236	215	21
9	192	184	8
10	224	208	16
11	238	206	32
12	197	169	28
13	169	182	$-13$−13
14	158	127	31
15	151	149	2
16	197	178	19
17	180	161	19
18	222	187	35
19	168	176	$-8$−8
20	168	145	23
21	167	154	13
22	161	153	8
23	178	137	12
24	137	125	1

Some investigators believe that the effects of diet on cholesterol are more evident in people with high rather than low cholesterol levels. If you split the data in the table above according to whether baseline cholesterol is above or below the median, can you comment descriptively on this issue?