In a new study of elderly adults, x=70 adults have been confirmed diabetic or prediabetic out of n=200 participants (p=0.35). Assuming the standard normal distribution can be applied, what is the Z-statistic for x=79? Recall that for a normal appx of a binomial distribution the expected value = np and the standard deviation = square root of n p open parentheses 1 minus p close parentheses end root