When conducting a t test for independent means, once the variances are known for each of the distributions of means, the variances can be added together to give the
A) pooled estimate of the population variance.
B) variance of the distribution of differences between means.
C) t score.
D) power of the study.
B
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Which of the following is NOT a contradiction about old-age?
A) The young-old are very different from the old-old. B) Some older people are active and healthy, while others are frail and impaired. C) While we equate aging with mental and physical decline, we also gravitate to the elderly for positive traits. D) Ageism exists only among the young, not the old.
Cassie is diagnosed with severe depression. Her psychiatrist has prescribed many medications and psychotherapy, all of which have not seemed to alleviate her depression. Her psychiatrist is now recommending __________
a) prefrontal lobotomy. b) electroconvulsive therapy. c) trephining. d) relaxation training and meditation.