Homework SourseA teacher gives a third grade class of n15 a reading skills
A teacher gives a third grade class of n=15 a reading skills test at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores are followed:
Subject
Pre-test
Post-Test
Difference
1
8
14
2
6
11
3
10
10
4
9
11
5
7
12
6
10
16
7
11
15
8
5
10
9
6
15
10
4
11
11
8
8
12
10
12
13
12
13
14
11
15
15
10
20
1) Fill the pre- and post-test scores difference in the blank, and calculate the mean difference.
Mean difference = _______________________________
(2) Ho: ___________________________________________________
(3) Ha: ___________________________________________________
(4) Appropriate statistical test (indicate type of statistical procedure, one or two sample, one- or two-tailed, and df if needed).
______________________________________________________________________
(5) Set up the SPSS dataset, and conduct a data analysis.
(6) Report the value of computed statistic:
______________________________________________________________________
(7) What is your decision about null hypothesis?
______________________________________________________________________
(8) Compute the Cohen
| Subject | Pre-test | Post-Test | Difference |
| 1 | 8 | 14 | |
| 2 | 6 | 11 | |
| 3 | 10 | 10 | |
| 4 | 9 | 11 | |
| 5 | 7 | 12 | |
| 6 | 10 | 16 | |
| 7 | 11 | 15 | |
| 8 | 5 | 10 | |
| 9 | 6 | 15 | |
| 10 | 4 | 11 | |
| 11 | 8 | 8 | |
| 12 | 10 | 12 | |
| 13 | 12 | 13 | |
| 14 | 11 | 15 | |
| 15 | 10 | 20 |
Solution
1) Fill the pre- and post-test scores difference in the blank, and calculate the mean difference.
Mean difference = _-4.4______________________________
(2) Ho: __dbar=0_________________________________________________
(3) Ha: __dbar not equal to 0_________________________________________________
(4) Appropriate statistical test (indicate type of statistical procedure, one or two sample, one- or two-tailed, and df if needed).
One sample ,two-tailed________________________________________________________
(5) Set up the SPSS dataset, and conduct a data analysis.
(6) Report the value of computed statistic:
__t=-5.64____________________________________________________________________
(7) What is your decision about null hypothesis?
__We reject the null hypothesis.___________________________________________
(8) Compute the Cohen
| Subject | Pre-test | Post-Test | Difference |
| 1 | 8 | 14 | -6 |
| 2 | 6 | 11 | -5 |
| 3 | 10 | 10 | 0 |
| 4 | 9 | 11 | -2 |
| 5 | 7 | 12 | -5 |
| 6 | 10 | 16 | -6 |
| 7 | 11 | 15 | -4 |
| 8 | 5 | 10 | -5 |
| 9 | 6 | 15 | -9 |
| 10 | 4 | 11 | -7 |
| 11 | 8 | 8 | 0 |
| 12 | 10 | 12 | -2 |
| 13 | 12 | 13 | -1 |
| 14 | 11 | 15 | -4 |
| 15 | 10 | 20 | -10 |
