Which type of error is used to compute the confidence interval for two independent samples selected from at least one population with an unknown variance?
A) standard error
B) estimated standard error
C) estimated standard error for the difference
D) estimated standard error for the difference scores

Question

Quizplus · Accepted Answer

When computing the confidence interval for two independent samples selected from at least one population with an unknown variance, the estimated standard error for the difference is used. This is because the difference between the sample means (which is used to compute the confidence interval) has its own variability, and this variability needs to be taken into account when estimating the confidence interval. The estimated standard error for the difference is calculated as the square root of the sum of the variances of the two samples divided by their respective sample sizes.

Which Type of Error Is Used to Compute the Confidence