An educational psychologist is interested in knowing whether the experience of attending preschool is related to...

An educational psychologist is interested in knowing whether the experience of attending preschool is related to subsequent sociability. She identifies two groups of first graders: those who had attended preschool and those who had not. Then each child is assigned a sociability score on the basis of observations made in the classroom and on the playground. Perform the 4 steps of hypothesis testing if using alpha is set at .05 for a two-tailed test.

The following sociability results are obtained:

Attended preschool Did not attend preschool

n₁ = 12 n₂ = 16

ΣX₁ = 204 ΣX₂ = 248

SS₁ = 192 SS₂ = 154

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orchestra answered 1 year ago

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