Unformatted text preview: research examining the effects of preschool childcare has found that children who spend time in day care, especially high
quality day care, perform better on math and language tests than children who stay home with their mothers or fathers. A researcher interested in this question took a random sample of n=25 children who attended day care before starting school and found that they had an average score of 87 on a standardized math test. For the sample data, SS = 1536. On that particular math test the population mean for individuals not having day care is μ = 81, and the scores are normally distributed. Compute and report the value of the appropriate test statistic used to determine if children with a history of preschool daycare are different from the general population on math scores s2 = sX = SS
1536
, s2 =
, s 2 = 64 n !1
24 s2
, sX =
n 64
,
25 s X = 2.56 , s X = 1.6 tX = X!µ
87 ! 81
6
, tX =
, tX =
, t = 3.75 sX
1.6
1.6 X 12)For alpha = 0.05, the critical values for t...
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This note was uploaded on 02/17/2013 for the course PSYC 60 taught by Professor Ard during the Fall '08 term at UCSD.
 Fall '08
 Ard
 Psychology

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