APU STATISTICS 332 SPSS Week 5 Assignment

SPSS ASSIGNMENT
#5

Tests for Two
Independent (or Different) Groups (or Samples)

To run the t
Test for Independent Samples:

****You can also
follow the steps in pages 200-203 of your text.

Once you have entered the data, click on Analyze, then on Compare
Means, and then click on Independent-Samples T Test…

A dialog box will appear, with your variables (student, condition, score)
on the left. Your options are (a) move one or more variables into the “Test
Variable(s)” box to select your dependent variables(s) and (b) move one of your
variables into the “Grouping Variable” box to select the independent variables
(or identify the groups to be compared).

Make “?” the dependent variable by moving it to the “Test Variable(s)”
box. Then make “?” your independent variable by moving it to the “Grouping
Variable” box. Now, the “Define Groups”
button is functioning, click on Define Groupsand another dialog box
appears. Here you must specify the two values of the condition variable that
represent the two groups you are comparing. Click in the box next to
Group 1 and type the number 1, then click in the box next to Group 2 and
type the number 2. Now you can click Continue
to return to the “Independent-Samples T Test” dialog box, and click on OK
to run the analysis.

1.
Enter the data named Chapter 11 Data Set 2 (pp.
372-373).

a.
Identify and test the research hypothesis at the .05
level of significance that boys raise their hands in class more often than
girls. Remember to first decide whether this is a one- or two-tailed test. What
is your conclusion regarding the research hypothesis? Copy and paste the results in this document.

b.
Using the data set Chapter 11 Data Set 2, test the
research hypothesis at the .01 level of significance that there is a difference
between boys and girls in the number of times they raise their hands in class.
What is your conclusion regarding the research hypothesis? Copy and paste the
results below.

c.
You used the same data for both parts a and b, but
you have a different hypothesis (one is directional and the other is
nondirectional). How do the results differ and why?

2. Enter
the data below, and then complete the tasks and/or answer the following
questions.

In-Home
Treatment

Out-of-Home
Treatment

3

7

4

6

1

7

1

8

1

7

3

6

3

5

6

6

5

4

1

2

4

5

5

4

4

3

4

6

3

7

6

5

7

4

7

3

7

8

8

7

a.
Write a brief paragraph about whether the in-home
counseling is equally effective as the out-of-home treatment for two separate groups.
The outcome variable is level of anxiety after treatment on a scale from 1 to
10. Copy and paste your results below.

3. Using
the data named Chapter 11 Data Set 4 (p. 374) test the null hypothesis that
there is no difference in group means between the number of words spelled
correctly for two groups of fourth graders?
What is your conclusion? Copy
and paste your results below.

Tests
Between the Means of Related Groups

Review and
follow the steps in pages 214-217 or your text.

4. For
the data set Chapter 12 Data Set 2 (p. 375), compute the t value using SPSS and write a conclusion as to whether there was a
change in tons of paper used as a function of the recycling program in 25
different districts. (Hint: before and after become the two levels of
treatment). Test the hypothesis at the .01 level. Copy and paste the results below.