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15 Cards in this Set
- Front
- Back
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What are between-subjects designs?
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Research designs that involve looking at differences between groups.
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What is the major assumption underlying the independent-means t-test?
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Both samples come from the same population.
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When do we use an independent-means t-test?
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When we are comparing two samples to see if they come from the same population.
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What is the pooled variance estimate (S2pooled)?
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A weighted average of the variance estimates from each sample.
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When calculating the pooled variance estimate (S2pooled), what do we use to weight the samples' variance estimates?
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Proportion of total degrees of freedom each sample contributes.
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What is the comparison distribution in an independent-means t-test?
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Distribution of differences between means
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Hypothetically, how would you construct a distribution of differences between means?
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Calculate the differences between all sample means from both populations and plot those differences.
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What is the value for the mean of the distribution of differences between means (Mdiff)?
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Zero
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What are the steps involved in calculating the standard deviation of the distribution between means (Sdiff)?
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1. Calculate the samples' variance estimates (S2).
2. Calculate the pooled variance estimate (S2pooled) 3. Calculate the variances of the distributions of means (S2m1 and S2m2) 4. Calculate the variance of the distribution of differences between means (S2diff) 5. Calculate the standard deviation of the distribution of differences between means (Sdiff) |
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How do you determine the populations in an independent-means t-test?
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Each group represents a population.
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Formula for pooled estimate of the population variance (i.e., pooled variance estimate)
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Formulas for the variances of the distributions of means in the independent means t-test.
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Formula for the variance of the distribution of differences between means.
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Formula for the standard deviation of the distribution of differences between means.
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Formula for the total degrees of freedom in the independent means t-test.
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