Researchers compared two groups of competitive rowers: a group of skilled rowers
ID: 2946258 • Letter: R
Question
Researchers compared two groups of competitive rowers: a group of skilled rowers and a group of novices. The researchers measured the angular velocity of each subject's right knee, which describes the rate at which the knee joint opens as the legs push the body back on the sliding seat. Researchers wish to test whether the mean knee velocity for skilled rowers is larger than that for novice rowers. They will use a pooled t test statistic. What assumption are they making about the variances of the populations?
?2S ? ?2N
The variances of the two populations, skilled and novice rowers, are equal.
The standard deviations for the two populations, skilled and novice rowers, are about the same.
The variance for the skilled rowers is larger than the variance for the novice rowers.
A.?2S ? ?2N
B.The variances of the two populations, skilled and novice rowers, are equal.
C.The standard deviations for the two populations, skilled and novice rowers, are about the same.
D.The variance for the skilled rowers is larger than the variance for the novice rowers.
Explanation / Answer
Answer is (B)
The variances of two populations, skilled and novice rowers are equal.
This is the assumption for pooled variance
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