A study is being planned to compare the effects of 2 different exercise protocols on the fine motor control of children with developmental delays. The children from a preschool for special needs childřen are targeted as subjects for this study. There are two classrooms specifically for these children, so each classroom is assigned to one of the 2 protocols. Classroom X gets the usual exercise protocol, while Classroom Y receives the newly designed exercise protocol. A test that includes letter tracing as a measure of fine motor control is administered to the children before and after the 16 weeks of the exercise protocols.

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A study is being planned to compare the effects of 2 different exercise protocols on the fine motor
control of children with developmental delays. The children from a preschool for special needs childřen
are targeted as subjects for this study. There are two classrooms specifically for these children, so each
classroom is assigned to one of the 2 protocols. Classroom X gets the usual exercise protocol, while
Classroom Y receives the newly designed exercise protocol. A test that includes letter tracing as a
measure of fine motor control is administered to the children before and after the 16 weeks of the
exercise protocols.
What is the most Ilkely threat to internal validity?
regression to the mean
O selection error
O mortality
maturation
Transcribed Image Text:A study is being planned to compare the effects of 2 different exercise protocols on the fine motor control of children with developmental delays. The children from a preschool for special needs childřen are targeted as subjects for this study. There are two classrooms specifically for these children, so each classroom is assigned to one of the 2 protocols. Classroom X gets the usual exercise protocol, while Classroom Y receives the newly designed exercise protocol. A test that includes letter tracing as a measure of fine motor control is administered to the children before and after the 16 weeks of the exercise protocols. What is the most Ilkely threat to internal validity? regression to the mean O selection error O mortality maturation
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