For each comparison listed below, indicate if a one-tailed or two-tailed statistical test is appropriate to determine whether: ? speeds after enactment of a lower speed limit are less than before ? speeds on an urban highway are different during peak or non-peak times ? the 85th percentile speed on a highway is greater than the speed limit
What will be an ideal response?
Using the definitions of the hypothesis testing, if the comparison is “greater than” or “less than” (but not both), then use a one-tail test. If the comparison is “different than,” then it could be either greater than or less than, so use a two-tail test.
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