QUESTION 17 An experiment comparing two treatment conditions produces 20 scores in each treatment. Which research design would require fewer subjects? "A Between Design B. Within Design O C. They both would require 40 subjects QUESTION 18 If al factors are helpconstant decreasing the sample size will cause the width of the confidence interval to A Decrease B. Increase C.Not change QUESTION 19 For the related samples t -test df = nj + n2 -2 True False QUESTION 20 For a one-sample t-test If the standard error of the mean equals 3 and the sample size equals 49, then the standard deviation of the population must equal. A A Remember and B B A 21 B. 12 C.2 ) D. 7