Which of the following is the correct null hypothesis for an independent-measures t test?

The cluster approach to categorizing personality disorders is based on:

(a) resemblance (b) recognition (c) redundancy (d) repetition

What does your text suggest about older women's sexual behavior?

A) They are more inhibited, due to their awareness of differences in their physical appearance compared to when they were younger. B) They are less sexually active because of cultural prohibitions against expressed sexuality among the aged. C) They are more sexually adventurous and willing to experiment. D) They are more inclined to be sexually active with more than one partner—in other words, less bound by ideas of monogamy.