Only numbers 18,19,20. For the matched t test, degrees of freedom are: A) the nu
ID: 80364 • Letter: O
Question
Only numbers 18,19,20. For the matched t test, degrees of freedom are: A) the number of the scores. B) the number of pairs. C) the number of scores minus 1. D) the number of pairs minus 1. For the matched t test, the standard error term is equivalent to: A) the standard error of the mean of the difference scores. B) the standard error of difference of the means. C) the all squareroot of the pooled variance. D). all of the above Matching subjects in pairs is usually preferable to repeated measures on the same subjects, whenever: A) there are simple order effects. B) there are differential carry-over effects. C) the correlation between the two sets of scores is low. D) all of the above. A harmonic mean allows us to: A) calculate a z score B) get two different values for the mean C) get one value for variance with unequal sample variances D) get one value for mean with unequal sample sizes A pooled variance allows us to: A) calculate a z score B) get two different values for the mean c) get one value for variance with unequal sample variances D) get one value for mean with unequal sample sizesExplanation / Answer
Answer 18 - B
matching subjects offers better sensitivity to small differences between conditions. there are no problems from carry over effects.
Answer 19 - D
When the sample sizes are not equal, the equivalent for each group needed to achieve the required statistical power is harmonic mean.
Answer 20 - C
when means values of each population is different, but assumption is made that the variance is same is known as pooled variance.
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