Question: Means and standard deviations for Exercise 12.6. (a) Calculate the standard error of the mean difference without assuming equal variances. (b) A computer program calculates

Means and standard deviations for Exercise 12.6.

(a) Calculate the standard error of the mean difference without assuming equal variances.

(b) A computer program calculates dfWelch

≈ 9 for these data. Based on this df, calculate a 95% confidence interval for μ1

− μ2

.

(c) Calculate the two-sided P-value for testing H0

: μ1

= μ2

.

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