Question

when testing for differences between treatment means, a confidence interval is computed with ________. a the sum of squared errors b the standard deviation c the mean square error d the standard error of the mean

Explanation:

When testing for differences between treatment means, a confidence interval is computed using the standard error of the mean. The standard error of the mean takes into account the variability of sample means around the population mean and is used in the formula for confidence intervals for means. The sum of squared errors, standard deviation, and mean square error are not directly used in the computation of the confidence - interval for comparing treatment means in the way the standard error of the mean is.

Answer:

D. the standard error of the mean