A researcher believed that a balanced diet will produce less weight loss than a carbohydrate diet. After selecting study participants for each group, each person weighed in before the study and after a six-week period. The researcher sampled 21 people on the carbohydrate diet and 11 people on the balanced diet and measured their weight loss.

Group 1 (Carbohydrate): mean loss = 13.32, s₁² = 4.3, n = 21

Group 2 (Balanced): mean loss = 17.44, s₂² = 2.2, n = 11

The value of the pooled standard deviation is equal to:

Group of answer choices

1.897

3.820

14.720

3.734