Cliff Gholston Graduate Stats Assignment
DUE: Monday, June 6, 2011[email protected]
INSTRUCTIONS:One of the most important things in stats is knowing which test to use. Ideally, analysis approaches should be part of the initial research design, but at a job, you may be faced with a pile of data and a report of how the experiment was done (some of my experiences - hello Army!). You need to decide which test is most appropriate, then figure out how to set up the data and run the tests. Thus, for the final, I want you to state at the beginning of the problem which test you are using. You will be using
Excel. Set up the raw data WITH LABLES and run the test. Put each problem on a different sheet within the same Workbook. You MUST follow these instructions in order to receive full credit for the problems. If you have questions, please ask.
And instructions for specific questions:
1. Complete by hand, but write your work in Excel.
2. State type of test, then complete problem in Excel.
3. Same as #2
4. Same as #2. Include only raw data, not T, SS, G, etc. Find the problem with the given sums (T, SS, or G).
5. Consult p 262 and p273 (Chart 11-8) in text
6. Same as #4
7. Complete by hand (within Excel) and confirm your answer in Excel. The answers need to be the same!
8. Same as #7. Use Data
9. By hand only
10. By hand only
TEXTNolan, S. A., & Heinzen, T. E. (2011).
Essentials of statistics for the behavioral sciences. New York, NY: Worth.
------------------------------------------------------------------------------------------------------------1.
A researcher is testing a null hypothesis that states: H: p = 50. A sample of 25 scores is selected and the mean is M = 55.Assuming that the sample variance is 2 = 100, compute the estimated standard error and the statistic. s this sample sufficient to reject the null hypothesis using a two-tailed test with a = .05? Assuming that the sample variance is s2 = 400, compute the estimated standard error and the t statistic. Is this sample sufficient to reject the null hypothesis using a two-tailed test with a = .05? Explain how increasing variance affects the standard error and the likelihood of rejecting the null hypothesis.
------------------------------------------------------------------------------------------------------2.
Calculate the difference scores and find MD for the following data from a repeated-measures study.
Subject Treatment I Treatment 2
A 34 44
B 41 39
C 30 45
D 21 30
3.
The following data were obtained from an independent measures study. Determine if there is a significant difference between the treatments. Use a = .01.
Treatment I Treatment 2
5 6
1 10
2 14
3 12
4 18
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4. The data below are from an independent-measures experiment comparing three different treatment conditions.
5. A researcher conducts an experiment comparing three treatment conditions with a separate sample n 8 in each treatment. An analysis of variance is used to evaluate the data, and the results of the ANOVA are presented in the table below. Complete all missing values in the table (Hint: Begin with the df values.)
6. The following data were collected from a repeated-measures study. Determine if there are any significant differences among the four treatments. Use the .05 level of significance.
Treat I Treat 2 Treat 3
0 I 4
0 4 3 G=24
0 1 6
2 1 3 SX
2
= 92
T=2 T=6 T=16
SS=3 SS=9 SS=6
Use an analysis of variance with a of .05 to determine whether these data indicate any significant differences among the treatments.
Source SS df MS F
Between 12 2.00
Within
Total
Participant A B C D
1 6 3 3 0
2 4 4 2 2 G = 44
3 4 2 0 2
4 6 3 3 0 SX
2= 172
T= 20 12 8 4
SS= 4 2 6 4
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7.
Compute the Pearson correlation for the following data:
X Y
7 3
3 1
6 5
4 4
5 2
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Find the regression equation for predicting Y from X for the following set of scores.
X Y
0 9
1 7
2 11
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A researcher is examining preferences among four new flavors of ice cream. A sample of n 80 people is obtained. Each person tastes all four flavors and then picks a favorite. The distribution of preferences is as follows. Do these data indicate any significance preferences among the four flavors? Test at the .05 level of significance.
Ice Cream Flavor
A B C D
12 18 28 22
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Compute the Spearman correlation for these ranked data.
X Y
2 5
4 1
3 2
1 4
5 3