Posted by jabrony on Monday, November 28, 2011 at 1:29pm.
Composite ACT Scores
NonAthletes Athletes
25 21 22
22 27 21
19 29 24
25 26 27
24 30 19
25 27 23
24 26 17
23 23
a. Test an appropriate hypothesis and state your conclusion. Use alpha = .05 for your test. Show the null and alternative hypothesis, the pvalue, your conclusion to reject or not, and finally a summarizing statement regarding your conclusion.
Then create a 90% confidence interval and tell me what it means in terms of the problem.

statistics (?)  PsyDAG, Tuesday, November 29, 2011 at 11:53am
You have two categories but three columns?
Find the means first = sum of scores/number of scores
Subtract each of the scores from its mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
Z = (mean1  mean2)/standard error (SE) of difference between means
SEdiff = √(SEmean1^2 + SEmean2^2)
SEm = SD/√n
If only one SD is provided, you can use just that to determine SEdiff.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.
90% = mean ± 1.645 SD (This is the Z score for .45 from the mean found in that same table.

statistics  jabrony, Tuesday, November 29, 2011 at 4:46pm
SO FAR I HAVE 9.63 FOR THE 1ST 2 COLUMNS
AND 7.56 FOR LAST COLUMN FOR THE VARIANCES. I GOT Z= .0875
SEDIFF =1.2364 SEm=.6019 for 1st set of #s and SEm=1.08 for 2nd set of #s
is that correct and now what?
Answer This Question
Related Questions
 STATISTICS HELP PLEASE  A total of 23 High School students were admitted to ...
 statistics am i right so far  SO FAR I HAVE 9.63 FOR THE 1ST 2 COLUMNS AND 7.56...
 Probability and Statistics  A research psychologist believes that professional ...
 Statistics  We conducted a hypothesis test for a population parameter at alpha...
 statistics  A researcher has collected statistics pretest scores for students ...
 Statistics  We conducted a hypothesis test for a population parameter at alpha...
 PLEASE HELP ME!!!  A researcher has collected statistics pretest scores for ...
 Math Anova  A researcher has collected statistics pretest scores for students ...
 I am really in need of someone help! Please  A researcher has collected ...
 Statistics  Describe a situation in which you would test a directional ...
More Related Questions