A 1-proportion Z test of the hypotheses Ho: p= 0.5 versus Ha: p# 0.5 produces a p- value of 0.027. Which of the following must be true? I.A 90% confidence interval for the true proportion will not contain the value 0.5 II. A 95% confidence interval for the true proportion will not contain the value 0.5 III. A 98% confidence interval for the true proportion will not contain the value 0.5 O II only O l only O Il and III only O l and Il only O None of the above O 1, Il and III

You want to assess the differences in frequency counts for four different groups. You know there are 150 people total. Without any additional information about how the data is distributed, what would you use for the "expected frequency" in each group?     a.1/4 b.37.5 c.25 d..375