*2.13 Compute the mean change in cholesterol. *2.14 Compute the standard deviation of the change in cholesterol levels. 2.15 Construct a stem-and-leaf plot of the cholesterol changes.
*2.13 Compute the mean change in cholesterol. *2.14 Compute the standard deviation of the change in cholesterol levels. 2.15 Construct a stem-and-leaf plot of the cholesterol changes.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Please only answer 2.18.
Transcribed Image Text:Cardiovascular Disease
The data in Table 2.15 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
Il available at cholesterol.xls at www.cengagebrain.com.
*2.13 Compute the mean change in cholesterol.
*2.14 Compute the standard deviation of the change in
cholesterol levels.
2.15 Construct a stem-and-leaf plot of the cholesterol
changes.
*2.16 Compute the median change in cholesterol.
2.17 Construct a box plot of the cholesterol changes to the
right of the stem-and-leaf plot.
2.18 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 Table 2.15
according to whether baseline cholesterol is above or
below the median, can you comment descriptively on this
issue?
Transcribed Image Text:TABLE 2.15 Serum-cholesterol
Subject
1
2
3
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
10.
and after adopting a vegetarian diet
Before
195
145
205
159
244
166
250
236
192
224
238
197
169
158
151
197
180
222
168
168
167
161
178
137
After
146
155
178
146
208
147
202
215
184
208
206
169
182
127
149
levels (mg/dL) before
178
161
187
176
145
154
153
137
125
Difference
49
-10
27
13
36
48
21
8
16
32
28
-13
2
19
35
-8
23
HET
13
8
41
12
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