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Population Means

Infants weighing more that 1700 grams who require respiratory assistance within the first 24 hours of birth and met other clinical criteria. The following table is a result of measurements of plasma volume (ml) made during mechanical ventilation.
subject / sample sz/ sample mean/ sample st. dev.
paralyzed/ 5 48.0 8.1
nonparalyzed/ 7 56.7 8.1

You may assume equal standard deviations. Construct a 98% confidence interval for the difference of the two population means.
Do you think there is a difference between the two population means?

Solution Preview

Construct the 98% confidence interval for the difference of the two population means
<br>Let Md=µ1- µ2= 56.7 - 48.0 = 8.7
<br>The estimated standard error, SMd, is computed assuming that the variances in the two populations are equal. when n1 &#8800; n2. The formula for MSE is:
<br>MSE = SSE/df
<br>where df is the ...

Solution Summary

Infants weighing more that 1700 grams who require respiratory assistance within the first 24 hours of birth and met other clinical criteria. The following table is a result of measurements of plasma volume (ml) made during mechanical ventilation.
subject / sample sz/ sample mean/ sample st. dev.
paralyzed/ 5 48.0 8.1
nonparalyzed/ 7 56.7 8.1

You may assume equal standard deviations. Construct a 98% confidence interval for the difference of the two population means.
Do you think there is a difference between the two population means?

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