Question
Independent Samples Effect Sizes Standardizer Point Estimate 95% Confidence Interval Lower Upper Grade point average Cohen's d .58305 .709 -.257 1.654 Hedges' correction .61229 .675
Independent Samples Effect Sizes
Standardizer
Point Estimate
95% Confidence Interval
Lower
Upper
Grade point average
Cohen's d
.58305
.709
-.257
1.654
Hedges' correction
.61229
.675
-.245
1.575
Glass's delta
.69744
.593
-.391
1.543
a. The denominator used in estimating the effect sizes.
Cohen's d uses the pooled standard deviation.
Hedges' correction uses the pooled standard deviation, plus a correction factor.
Glass's delta uses the sample standard deviation of the control group.
Independent Samples Test
Levene's Test for Equality of Variances
t-test for Equality of Means
F
Sig.
t
df
Significance
Mean Difference
Std. Error Difference
95% Confidence Interval of the Difference
One-Sided p
Two-Sided p
Lower
Upper
Grade point average
Equal variances assumed
8.246
.011
1.504
16
.076
.152
.41333
.27485
-.16933
.99600
Equal variances not assumed
1.504
13.495
.078
.156
.41333
.27485
-.17825
1.00491
Group Statistics
Membership Status of Subjects
N
Mean
Std. Deviation
Std. Error Mean
Grade point average
Sorority member
9
3.5833
.43986
.14662
non-member
9
3.1700
.69744
.23248
Independent Samples Effect Sizes | |||||
Standardizer | Point Estimate | 95% Confidence Interval | |||
Lower | Upper | ||||
Grade point average | Cohen's d | .58305 | .709 | -.257 | 1.654 |
Hedges' correction | .61229 | .675 | -.245 | 1.575 | |
Glass's delta | .69744 | .593 | -.391 | 1.543 | |
a. The denominator used in estimating the effect sizes. Cohen's d uses the pooled standard deviation. Hedges' correction uses the pooled standard deviation, plus a correction factor. Glass's delta uses the sample standard deviation of the control group. |
Independent Samples Test | |||||||||||
Levene's Test for Equality of Variances | t-test for Equality of Means | ||||||||||
F | Sig. | t | df | Significance | Mean Difference | Std. Error Difference | 95% Confidence Interval of the Difference | ||||
One-Sided p | Two-Sided p | Lower | Upper | ||||||||
Grade point average | Equal variances assumed | 8.246 | .011 | 1.504 | 16 | .076 | .152 | .41333 | .27485 | -.16933 | .99600 |
Equal variances not assumed | 1.504 | 13.495 | .078 | .156 | .41333 | .27485 | -.17825 | 1.00491 |
Group Statistics | |||||
Membership Status of Subjects | N | Mean | Std. Deviation | Std. Error Mean | |
Grade point average | Sorority member | 9 | 3.5833 | .43986 | .14662 |
non-member | 9 | 3.1700 | .69744 | .23248 |
Name assumptions.
How you know the assumptions were not violated.
State your hypothesis in words and symbols
Citical value.
Summarize data into appropriate test statistic
Evaluate and interpret the null hypothesis.
Compute the 95% Confidence Interval , what were the mean difference, the standard error and critical values Interpret your confidence interval.
If you Changed your Critical Value to = 0.01 What would your new critical value be. Would this change your decision about your null hypothesis.
Compute the Effect Size and Power
Output(s) from G*Power (or SamplePower).
Discuss your findings and interpret Power.
Is your Power value accurate? Why or why not.
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