6. Alarge-sample test for the difference between two populations can beconducted

Question

6. Alarge-sample test for the difference between two populations can beconducted safely provided either of the two samples exceeds 30.

7. The recommended procedure for estimating the pooled variance isto combine all the data from both samples together and calculatethe variance as if it were one sample.

8. If two samples both have less than 30 observations and unknownvariances, there is no statistical test that can be used to comparethe population means, even if both populations are normallydistributed.

9. Given a paired study with 14 pretreatment measures and 14post-treatment measures, the number of degrees of freedom for thetest statistic is 28 – 1 = 27.

10. The null hypothesis for the difference between two populationvariances is the same for both two-sided, lower-tail, andupper-tail tests.

Explanation / Answer

6.True

7.True

8.False

9.False

10.False

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