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Stat Tutor

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1:34

Correct. Equal sample sizes should be used whenever possible to give the most accurate results.

Incorrect. Equal sample sizes should be used whenever possible to give the most accurate results.

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Correct. When the populations have similar shapes, two-sample *t* procedures give more accurate results than when the shapes are different.

Incorrect. When the populations have similar shapes, two-sample *t* procedures give more accurate results than when the shapes are different.

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Correct. Two-sample *t* procedures are not robust and do not give good results when there are outliers

Incorrect. Two-sample *t* procedures are not robust and do not give good results when there are outliers

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3:28

Correct. The most important condition is appropriate data collection; the analysis may be worthless if the data are not any good.

Incorrect. The most important condition is appropriate data collection; the analysis may be worthless if the data are not any good.

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