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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
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Can you help explain 2.35? Thank you
? e or VS or ys s? re ne CO- u- WS on ny (b) the ink me use match reality? (This phenomenon extends what we learned about the inability of students to select unbiased samples in Chapter 1. In this case, students tend to notice heavy drinkers dis- 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. (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? 9
Transcribed Image Text:? e or VS or ys s? re ne CO- u- WS on ny (b) the ink me use match reality? (This phenomenon extends what we learned about the inability of students to select unbiased samples in Chapter 1. In this case, students tend to notice heavy drinkers dis- 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. (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? 9
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- ING Exercises 2.36 to 2.38 deal with an experiment to study the effects of financial incentives to quit 25 100 80 60- 40 20 0 Page 69 G 9⁹ O of 2.1 Categorical Variables Male Female (b) Relative frequency counts Response Stress affected grades Stress, but no effect No stress 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 fewer of the original subjects assigned to that group agreed to participate. The researchers also found that 30 of the smokers originally in the Deposit Jumaton
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- ING Exercises 2.36 to 2.38 deal with an experiment to study the effects of financial incentives to quit 25 100 80 60- 40 20 0 Page 69 G 9⁹ O of 2.1 Categorical Variables Male Female (b) Relative frequency counts Response Stress affected grades Stress, but no effect No stress 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 fewer of the original subjects assigned to that group agreed to participate. The researchers also found that 30 of the smokers originally in the Deposit Jumaton
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