1. State the research hypothesis(non-directional) and the null hypothesis. Makesure you include both DV and IV in the hypotheses from #1 above
2.According to the post-hoc results table, which pairs of thecottages do show the statistically significant difference in“Number of traumas experienced” (e.g. “Cottage A vs. B”)?
SPSS Dataset | SPSS Data for HW (500 cases).sav (available in Canvas) |
Variable Names in the dataset | cottage: Cottage assignment (Cottage A, B, & C) |
trauma: Number of traumas experienced |
Descriptives |
Number of traumas experienced |
| N | Mean | Std. Deviation | Std. Error | 95% Confidence Interval for Mean | Minimum | Maximum |
Lower Bound | Upper Bound |
Cottage A | 170 | 1.88 | .902 | .069 | 1.75 | 2.02 | 1 | 4 |
Cottage B | 170 | 1.59 | .494 | .038 | 1.51 | 1.66 | 1 | 2 |
Cottage C | 160 | 4.75 | 2.736 | .216 | 4.32 | 5.18 | 2 | 10 |
Total | 500 | 2.70 | 2.177 | .097 | 2.51 | 2.89 | 1 | 10 |
Test of Homogeneity ofVariances |
Number of traumas experienced |
Levene Statistic | df1 | df2 | Sig. |
318.765 | 2 | 497 | .000 |
Robust Tests of Equality ofMeans |
Number of traumas experienced |
| Statistica | df1 | df2 | Sig. |
Welch | 106.654 | 2 | 268.787 | .000 |
a. Asymptotically F distributed. |
MultipleComparisons |
Dependent Variable:Â Â Number of traumasexperienced |
| (I) Cottage | (J) Cottage | Mean Difference (I-J) | Std. Error | Sig. | 95% Confidence Interval |
| Lower Bound | Upper Bound |
Bonferroni | Cottage A | Cottage B | .294 | .180 | .309 | -.14 | .73 |
Cottage C | -2.868* | .183 | .000 | -3.31 | -2.43 |
Cottage B | Cottage A | -.294 | .180 | .309 | -.73 | .14 |
Cottage C | -3.162* | .183 | .000 | -3.60 | -2.72 |
Cottage C | Cottage A | 2.868* | .183 | .000 | 2.43 | 3.31 |
Cottage B | 3.162* | .183 | .000 | 2.72 | 3.60 |
Games-Howell | Cottage A | Cottage B | .294* | .079 | .001 | .11 | .48 |
Cottage C | -2.868* | .227 | .000 | -3.40 | -2.33 |
Cottage B | Cottage A | -.294* | .079 | .001 | -.48 | -.11 |
Cottage C | -3.162* | .220 | .000 | -3.68 | -2.64 |
Cottage C | Cottage A | 2.868* | .227 | .000 | 2.33 | 3.40 |
Cottage B | 3.162* | .220 | .000 | 2.64 | 3.68 |
*. The mean difference is significantat the 0.05 level. |