Pairing the US and CS is essential for _______ to occur

Which study would provide the best picture of worldwide developmental growth patterns?

a. Examining patterns of friendship in each grade level at an elementary school in Tokyo. b. Watching a newborn turn into an adult. c. Comparing children raised in Bangladesh to those raised in the United States. d. Every two years, looking at a set group of subjects across 50 randomly chosen countries from birth to death.

If a researcher reported for a correlated-groups t test that t(22) = 2.69, p < .01, how many subjects were there in the study?

a. 23 b. 20 c. 22 d. 21