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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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last question is yes or no

Incentives to Exercise A study was designed to see what type of incentive might be most effective in encouraging people to exercise. In the study, 281 overweight or obese people were assigned the goal to walk 7000 steps a day, and their activity was tracked for 100 days. The response variable is the number of days (out of 100) that each participant met the goal. The participants were randomly assigned to one of four different incentive groups: for each day they met the goal, participants in the first group got only praise, participants in the second group got entered into a lottery, and participants in the third group received cash (about $1.50 per day). In the fourth group, participants received all the money up front and lost money (about $1.50 per day) if they didn't meet the goal. (The overall financial effect for participants in the third and fourth conditions is identical, but the psychological effect between winning money and losing money is potentially quite different.) The summary statistics for the four conditions and overall are shown in the table below. Condition Mean St.Dev. Praise 70 30.0 32.0 Lottery 70 35.0 29.9 Get money 70 36.0 29.4 Lose money 71 45.0 30.1 Overall 281 36.5 30.6865 Table 1 Number of days meeting an exercise goal 1Summary statistics are estimated from information given in the paper. (a) In the sample, which incentive had the most success in helping participants meet the goal? O Praise O Lottery O Get money O Lose money eTextbook and Media In the sample, which incentive had the least success in helping participants meet the goal? O Praise O Lottery O Get money O Lose money eTextbook and Media (b) Do the conditions for using the F-distribution appear to be met? O Yes O No eTextbook and Media (c) Test to see if the data provide evidence of a difference in mean success rates depending on the incentive used. Fill in the following ANOVA table. Round your answers for the SS and MS columns to the nearest integer. Round your answer for the F-statistic to two decimal places and your answer for the p-value to three decimal places. Source df SS MS F-Statistic P-Value Groups i i i Error i Total i i Do we find evidence of a difference in means between the groups?
Transcribed Image Text:Incentives to Exercise A study was designed to see what type of incentive might be most effective in encouraging people to exercise. In the study, 281 overweight or obese people were assigned the goal to walk 7000 steps a day, and their activity was tracked for 100 days. The response variable is the number of days (out of 100) that each participant met the goal. The participants were randomly assigned to one of four different incentive groups: for each day they met the goal, participants in the first group got only praise, participants in the second group got entered into a lottery, and participants in the third group received cash (about $1.50 per day). In the fourth group, participants received all the money up front and lost money (about $1.50 per day) if they didn't meet the goal. (The overall financial effect for participants in the third and fourth conditions is identical, but the psychological effect between winning money and losing money is potentially quite different.) The summary statistics for the four conditions and overall are shown in the table below. Condition Mean St.Dev. Praise 70 30.0 32.0 Lottery 70 35.0 29.9 Get money 70 36.0 29.4 Lose money 71 45.0 30.1 Overall 281 36.5 30.6865 Table 1 Number of days meeting an exercise goal 1Summary statistics are estimated from information given in the paper. (a) In the sample, which incentive had the most success in helping participants meet the goal? O Praise O Lottery O Get money O Lose money eTextbook and Media In the sample, which incentive had the least success in helping participants meet the goal? O Praise O Lottery O Get money O Lose money eTextbook and Media (b) Do the conditions for using the F-distribution appear to be met? O Yes O No eTextbook and Media (c) Test to see if the data provide evidence of a difference in mean success rates depending on the incentive used. Fill in the following ANOVA table. Round your answers for the SS and MS columns to the nearest integer. Round your answer for the F-statistic to two decimal places and your answer for the p-value to three decimal places. Source df SS MS F-Statistic P-Value Groups i i i Error i Total i i Do we find evidence of a difference in means between the groups?
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