We are running a hypothesis test to see if blood pressure of African zebras differs significantly from Arabian horses.  We assume blood pressure in both populations is normally distributed and both populations have the same population variance in blood pressure which is unknown to us, so we use the sample variances to estimate the standard error for our calculations.  We have a sample of size 9 for the African zebras with mean 180 and a sample of size 16 for the Arabian horses with mean 190.  If the pooled variance is 36, then what is the standard error estimate for the estimator of the true mean difference in weight for the two populations? 15 NONE OF THE OTHERS 1.25 1.57 2.5

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We are running a hypothesis test to see if blood pressure of African zebras differs significantly from Arabian horses.  We assume blood pressure in both populations is normally distributed and both populations have the same population variance in blood pressure which is unknown to us, so we use the sample variances to estimate the standard error for our calculations.  We have a sample of size 9 for the African zebras with mean 180 and a sample of size 16 for the Arabian horses with mean 190.  If the pooled variance is 36, then what is the standard error estimate for the estimator of the true mean difference in weight for the two populations?

15
NONE OF THE OTHERS
1.25
1.57
2.5
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