# ?Exercises on Paired t and Independent t tests

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!
stat_exercise_4_spr_18_.docx

spss_handouts_indep_t_test_exercise_4.pdf

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Stat Exercise 4
(Due: 4/25. Attach all SPSS outputs.)
SPSS software required
1.
Exercises on Paired t and Independent t tests
A) p. 146-147, in spss handouts for paired t test in the Assignments folder.
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 Pearsons correlation, Scatterplot, and Cronbachs 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
Interested 1
2
3
4 5
6
7
Not Interested
Bored
1
2
3
4 5
6
7
Excited
Like it
1
2
3
4 5
6
7
Dislike it
Instructions for correlation and alpha (also see spss recoding under SPSS
guide and datasets):
Before running Pearson correlation and Cronbachs 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.
a. By following the procedure (Analyze-Scale-Reliability analysis) in spss
Cronbachs alpha, compute Cronbachs 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
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 Pearsons correlation. How is a persons 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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