When working to determine statistically valid differences between two population

Question

When working to determine statistically valid differences between two population means what are the general guidelines used to for establishment of equal or unequal population variances? Never assume equality of variances. Always use the methodology for unequal variances. If the ratio of variances is between 0.333 and 3.000, they are probably equal. When in doubt, equal it out. The 3 standard deviation breakpoints on the normal curve approximate 68%, 95% and 98% of the data. If you always assume equality of variances, the results will always follow a normal distribution.

Explanation / Answer

By some convention,

OPTION B: If the ratio of variances is between 0.333 and 3.000, they are probably equal. [ANSWER]

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[The safer choice, by default, is that variances are not equal. However, if this requirement is met, then some classes assume they are equal.]

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