2.35 Does Stress Affect Academic Performance? Students in the ACHA-NCHA survey were asked, "Within the last 12 months, has stress negatively affected your academics?" Figure 2.4(a) shows a segmented bar chart for response frequencies, while Figure 2.4(b) shows a segmented bar chart for response relative frequencies as percents. Possible responses were "I haven't had any stress," shown in red, "I've had stress but it hasn't hurt my grades," shown in green, or "I've had stress and it has hurt my grades," shown in blue. (a) Did more males or more females answer the survey or did approximately equal numbers of males and females participate? Is graph (a) or (b) more helpful to answer this question? (b) Did a greater number of males or females say they had no stress or is it approximately equal between males and females? Is graph (a) or (b) more helpful to answer this question?
2.35 Does Stress Affect Academic Performance? Students in the ACHA-NCHA survey were asked, "Within the last 12 months, has stress negatively affected your academics?" Figure 2.4(a) shows a segmented bar chart for response frequencies, while Figure 2.4(b) shows a segmented bar chart for response relative frequencies as percents. Possible responses were "I haven't had any stress," shown in red, "I've had stress but it hasn't hurt my grades," shown in green, or "I've had stress and it has hurt my grades," shown in blue. (a) Did more males or more females answer the survey or did approximately equal numbers of males and females participate? Is graph (a) or (b) more helpful to answer this question? (b) Did a greater number of males or females say they had no stress or is it approximately equal between males and females? Is graph (a) or (b) more helpful to answer this question?
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
Can you explain 2.35
Transcribed Image Text:rd Edition
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proportionately.)
2.35 Does Stress Affect Academic Performance?
Students in the ACHA-NCHA survey were asked,
"Within the last 12 months, has stress negatively
affected your academics?" Figure 2.4(a) shows a
segmented bar chart for response frequencies, while
Figure 2.4(b) shows a segmented bar chart for
response relative frequencies as percents. Possible
responses were "I haven't had any stress," shown in
red, "I've had stress but it hasn't hurt my grades,"
shown in green, or "I've had stress and it has hurt
my grades," shown in blue.
6000-
5000-
4000-
(a) Did more males or more females answer the
survey or did approximately equal numbers of
males and females participate? Is graph (a) or
(b) more helpful to answer this question?
(b) Did a greater number of males or females say
they had no stress or is it approximately equal
between males and females? Is graph (a) or (b)
more helpful to answer this question?
Mon Sep
Sho
Transcribed Image Text:Kindle for Mac - Statistics: Unlocking the Power of Data, 3rd Edition
20,000
15,000-
10,000
5000
0
Female
Male
(a) Frequency counts
Figure 2.4 Has stress hurt your grades?
Response.
Stress affected
grades
Stress, but no
effect
No stress
(c) Did a greater percent of males or females say
they had no stress or is it approximately equal
between males and females? Is graph (a) or (b)
more helpful to answer this question?
(d) Did a greater percent of males or females say
that stress affected their grades or is it approx-
imately equal between males and females? Is
graph (a) or (b) more helpful to answer this
question?
FINANCIAL INCENTIVES TO QUIT SMOK-
100
80
60
40.
20-
0
Page 69
of i
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2.1 Categorical Variables
Male
Female
(b) Relative frequency counts
Response
Stress affected
grades
Stress, but no
effect
No stress
80
69
agreed to participate. However, only 146 of the 1053
smokers assigned to the Deposit group agreed to
participate (since they had to risk some of their own
money). Set up a two-way table and compare the
participation rates between subjects assigned to the
two treatment groups.
2.38 Accounting for Participation Rates Exer-
cises 2.36 and 2.37 show that smokers who agreed
to be in the Deposit group (having their own money
at risk) were much more likely to quit smoking
than those enrolled in the Reward group, but many
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