Recitation Exercise Test Statistics and Hypothesis Testing Answer the following questions. You are allowed to work in groups, but everyone must show ALL of their work. Feelfree to attach an additional sheet of paper. 1.) A research believes that children who grow up as an only child develop vocabulary skills at a faster rate than children in large families. To test this, a sample of n = 25 four-year-old only children are tested on a standardized vocabulary test ([1 = 60, a = 10). The sample obtains a mean of M = 63.8. Test at the or = .05 level. a.) Step 1: State the Hypotheses Ho: H12 b.) Step 2: Determine the critical region and draw it on the distribution above: 20mm]; c.) Step 3: Calculate the test statistics (here: a z-test). Zobserved =