Social Studies, 10.04.2020 21:57 cici86
Jack wants to test whether runners on his cross-country team improve with his new training regimen. He measures their run times at the beginning of the season and again at the end of the season. Runners in Jack's study improving their times due to running generally and not necessarily due to the new regimen is an example of which of the following threats?a. Selection
b. Maturation
c. History
d. Instrumentation
Answers: 1
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Jack wants to test whether runners on his cross-country team improve with his new training regimen....
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