Exercises on Paired t and Independent t testsp. 146-147, in spss handouts for paired t test in the Assignments folder. Answer all questions. To answer f., please model the example statements on p. 144 & 145. p. 161, in spss handouts for indep t test. Answer all questions. To answer f., please model the example statements on p. 159. See attached file for more details!
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Stat Exercise 4
(Due: 4/25. Attach all SPSS outputs.)
SPSS software required
Exercises on Paired t and Independent t tests
A) p. 146-147, in spss handouts for paired t test in the Assignments folder.
Answer all questions. To answer f., please model the example statements on
p. 144 & 145.
B) p. 161, in spss handouts for indep t test. Answer all questions. To answer
f., please model the example statements on p. 159.
2. Exercises on Pearsons correlation, Scatterplot, and Cronbachs alpha.
Use the data file class data 3070 spr 18.sav under SPSS guides and datasets.
The class survey contains the following three items that measure the variable -Motivation:
1. My feeling of taking this research methods class
Instructions for correlation and alpha (also see spss recoding under SPSS
guide and datasets):
Before running Pearson correlation and Cronbachs alpha, you must reverse the
scores of the items in the opposite direction of the variable Motivation first. To
reverse the score for those items, change 1 to 7, 2 to 6, 3 to 5, 4 to 4,
5 to 3, 6 to 2, and 7 to 1. To do it in SPSS, on Transform menu, click
Recode and Into Same Variable. Select both items. Then click old and new
values button. Enter the number in old value box and in new value box, and then
click add box. For example, to reverse an old value (=1) to a new value (=7),
enter 1 in the old value box and 7 in the new value box, and then click add
button. Do the same for other values (2, 3, 4, 5, 6, 7). Click continue and then
click ok. You should see the changes on the data entry sheet.
To compute a total score for the variable Motivation, on Transform menu, click
Compute, enter the name — Motivation into target variable, select all three
items, and insert a + between each item. Then click ok. On the data entry sheet,
you should see the total score of a new variable on the last column.
Answer the following questions:
a. By following the procedure (Analyze-Scale-Reliability analysis) in spss
Cronbachs alpha, compute Cronbachs alpha using all three items. Is the
scale reliable? Interpret.
b. By following the procedure (Graphs-Legacy Dialogs-Scatter/Dot) in spss
scatterplots, produce a scatterplot using the X variable Motivation (use
the total score) and Y variablefinal grade (finalgrade). Does it appear
that a relationship between the two exists? If yes, is it positive or negative?
c. By following the procedure (Analyze-Correlate-Bivariate) in spss
correlations, compute Pearsons correlation. How is a persons Motivation
(use total score) related to his or her anticipated final grade? Report the
result by modeling the example statement on p. 47.
d. Compute R-square by hands. What does that number indicate?
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