Random Thoughts XIV

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#9,377
#9,377
or talk about the first thing that pops up...which in tex case won't be what you think...unless the little blue pill has been taken
 
#9,379
#9,379
ImTheCrew said:
type me out a easier problem let me see if i remember, probably not but its worth a try.
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For the following, please calculate the appropriate t-test by hand (showing your work).

A criminologist is interested in whether there exists a disparity in sentencing based on the race of a defendant. She selected at random 18 burglary convictions and compared the prison terms given to the 10 whites and 8 blacks sampled. The sentence lengths (in years) are shown below. Using these data, test the null hypothesis that whites and blacks convicted of burglary in this jurisdiction do not differ with respect to prison sentence length.


Whites Blacks
3 8
5 6
7 4
6 9
5 8
3 7
2 6
7 8
6 *
2 *


16.

17.

18.

19.

20


21. Calculated t ratio = ________

22. Critical t ratio (alpha = .05) ________

23. Reject or Fail to Reject the Null? _________
 
#9,381
#9,381
You can;t do this one, but this is the only part of the file that is complete.


Below are math scores for 20 school children who took part in a new math program geared towards increasing numerical fluency. Please enter the data into SPSS and answer the following:


Math Score Math Score
Subject before Treatment after Treatment
1 85 85
2 95 94
3 86 87
4 87 84
5 74 76
6 93 94
7 89 91
8 76 75
9 79 79
10 86 84
11 84 86
12 95 94
13 93 92
14 74 74
15 98 97
16 87 89
17 75 79
18 75 77
19 94 95
20 91 90



State the null and alternate hypotheses for the following research question: The new math program significantly influences numerical fluency among school children

9. Null:
10. Alternate:
11. What is the mean math score prior to the Math Program? ___________
12. What is the mean math score after administering the Math Program? _______
13. Assume α= .05. What is the critical t-ratio? ______
14. What is the calculated t-ratio? _______
15. Do you reject or fail to reject the null hypothesis? _______
 
#9,386
#9,386
i don't have a calculator... but i doubt i remember exactly how to do it... that saddens me............................................................. :cray:
 
#9,393
#9,393
I usually just use it for about 10-20 data points taken from experiments. Use it a bit for numerical/statistical analysis but it isn't large amounts of data I work with.
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#9,396
#9,396
ImTheCrew said:
i can catch on very fast with math.. and love doing it but just as fast i forget.
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I'm the same way. I usually brush up for about 30 mins before a test. Works for that test but its not good for retaining the material long term
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#9,397
#9,397
jtflew said:
I usually just use it for about 10-20 data points taken from experiments. Use it a bit for numerical/statistical analysis but it isn't large amounts of data I work with.
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Click to expand...

We work with 50-150 variables and up to 5000 participants.
 
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