Riley, a child psychologist, claims that for all samples of size 40 from the population of infant boys and all samples of size 40 of newborn girls, the mean of the sampling distribution of the difference in sample means (boys minus girls) is 0.2 month. Is Riley correct? Yes, the mean is 8.1−7.9=0.2 month. A No, the mean is 0.8−0.7=0.1 month. B No, the mean is 8−8=0 months. C No, the mean is 8.1−0.8=7.3 months. D No, the mean is 7.9−0.7=7.2 months.

Can someone make a thesis statement out of this? some historians have called the civil war and reconstruction period a “second american revolution.”

What is the tychonic system? a. a model of the solar system in which all the planets (including earth) orbit the sun b. a model of the solar system in which the planets, moon, and sun orbit earth c. a model of the solar system where the planets orbit the sun, and this system orbits earth d. a model where all the planets and earth are fixed in space and only the sun and moon move e. a model that expands the system to a vast number of galaxies and star systems

Terrence would like to reward himself after each goal he sets, but he's not sure what type of reward to choose. he's easily distracted and finds it hard to concentrate at times. which would be the best type of reward for terrence? a. a brief social network break b. a long nap c. a snack while he keeps studying d. watching a couple of tv shows