A researcher was interested in the relationship between a swimmer’s hand length and corresponding time to complete the 100-meter freestyle. The researcher selected a random sample of twenty swimmers from all participants in a swim competition. Assuming all conditions for inference are met, which of the following significance tests should be used to investigate whether there is convincing evidence, at a 5 percent level of significance, that a longer hand length is associated with a decrease in the time to complete the 100-meter freestyle? A matched-pairs t-test for a mean difference A A two-sample t-test for a difference between means B A two-sample z-test for a difference between proportions C A chi-square test of independence D A linear regression tt-test for slope E
A researcher was interested in the relationship between a swimmer’s hand length and corresponding time to complete the 100-meter freestyle. The researcher selected a random sample of twenty swimmers from all participants in a swim competition. Assuming all conditions for inference are met, which of the following significance tests should be used to investigate whether there is convincing evidence, at a 5 percent level of significance, that a longer hand length is associated with a decrease in the time to complete the 100-meter freestyle?
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A matched-pairs t-test for a mean difference
A -
A two-sample t-test for a difference between means
B -
A two-sample z-test for a difference between proportions
C -
A chi-square test of independence
D -
A linear regression tt-test for slope
E
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