Unformatted text preview: the treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be 33, with a sample variance of 81. Calculate and report the value of the appropriate test statistic used to determine if there is evidence of an effect of treatment. sX = s2
, sX =
n 81
,
9 s X = 9 , s X = 3 tX = X!µ
33 ! 40
!7
, tX =
, tX =
, t X = !2.33 sX
3
3 6) For alpha = 0.05, the critical values for the above test are t critical = ± 2.306 7) Given the test statistic and critical values you found above, what should we conclude about the effect of the treatment? 1. Reject the null hypothesis. We conclude that there really is an effect of treatment. 2. Fail to reject the null hypothesis. We conclude that there is not sufficient evidence to say that there is an effect of this treatment. tobserved > tcritical, 
2.33 > 2.306, Reject Null Hypothesis 8) For the same s...
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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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