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George Bush established a task force on "Surviving Bioterror." He wanted to determine the survival training program's effectiveness, so he studied at a university in Arizona and one in Nebraska. Because of restrictions set by the human subjects' committees, subjects could not be randomly assigned to a survivor training or control group. Instead, the researchers had to get people to volunteer for one group or the other. The results of the study are presented in Tables 2-3 below. Higher scores represent better survival skills (0 = poor; 10 = excellent). A difference of 1 point is statistically significant. Question: Based on tables, which school provides better or stronger results and how do we know? And can we identify what 2 factor aside from training that may explain the Arizona results (for instance, what are the threats internal validity?) Table 2. Mean survival skills scores at Arizona. Training Controls Pre-test 8 4 Post-test 9 8 Table 3. Mean survival skills scores at Nebraska. Training Pre-test 4 Controls 4 Post-test 9 4

George Bush established a task force on "Surviving Bioterror." He wanted to determine the survival training program's effectiveness, so he studied at a university in Arizona and one in Nebraska. Because of restrictions set by the human subjects' committees, subjects could not be randomly assigned to a survivor training or control group. Instead, the researchers had to get people to volunteer for one group or the other. The results of the study are presented in Tables 2-3 below. Higher scores represent better survival skills (0 = poor; 10 = excellent). A difference of 1 point is statistically significant. Question: Based on tables, which school provides better or stronger results and how do we know? And can we identify what 2 factor aside from training that may explain the Arizona results (for instance, what are the threats internal validity?) Table 2. Mean survival skills scores at Arizona. Training Controls Pre-test 8 4 Post-test 9 8 Table 3. Mean survival skills scores at Nebraska. Training Pre-test 4 Controls 4 Post-test 9 4

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section: Chapter Questions
Problem 8SGR
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Want to understand practice scenarios from my tips book on experimental designs and threats to internal and external validity. 

George Bush established a task force on "Surviving Bioterror." He wanted to determine the survival training program's effectiveness, so he studied at a university in Arizona and one in Nebraska. Because of restrictions set by the human subjects' committees, subjects could not be randomly assigned to a survivor training or control group. Instead, the researchers had to get people to volunteer for one group or the other. The results of the study are presented in Tables 2-3 below. Higher scores represent better survival skills (0 = poor; 10 = excellent). A difference of 1 point is statistically significant. Question: Based on tables, which school provides better or stronger results and how do we know? And can we identify what 2 factor aside from training that may explain the Arizona results (for instance, what are the threats internal validity?) Table 2. Mean survival skills scores at Arizona. Training Controls Pre-test 8 4 Post-test 9 8 Table 3. Mean survival skills scores at Nebraska. Training Pre-test 4 Controls 4 Post-test 9 4
Transcribed Image Text:George Bush established a task force on "Surviving Bioterror." He wanted to determine the survival training program's effectiveness, so he studied at a university in Arizona and one in Nebraska. Because of restrictions set by the human subjects' committees, subjects could not be randomly assigned to a survivor training or control group. Instead, the researchers had to get people to volunteer for one group or the other. The results of the study are presented in Tables 2-3 below. Higher scores represent better survival skills (0 = poor; 10 = excellent). A difference of 1 point is statistically significant. Question: Based on tables, which school provides better or stronger results and how do we know? And can we identify what 2 factor aside from training that may explain the Arizona results (for instance, what are the threats internal validity?) Table 2. Mean survival skills scores at Arizona. Training Controls Pre-test 8 4 Post-test 9 8 Table 3. Mean survival skills scores at Nebraska. Training Pre-test 4 Controls 4 Post-test 9 4
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