One sample has n = 12 with SS = 286, and a second sample has n = 12 with SS = 242.

Find the pooled variance for the two samples. Do not include any decimal places in your answer.

sp2 =

Compute the estimated standard error for the sample mean difference. Do not include any decimal places in your answer.

s(M1 - M2) =

If the sample mean difference is 5 points, what would be the critical t-value (at the .05 level) and the observed t-value? (Use three decimal places for the critical value, two for the t statistic.)

t-critical = ±

t =