In the following Binomial problem X = # of planes that are on time P=.80 Y = # of planes that are not on time q = .20 What would be the best Binomial method to use to find the probability that between 72% and 85% of the next 70 planes will be on time? Binomial tables normal approximation O p sampling distribution O Binomial formula 24 1.5 points Suppose the z-score for a test statistic in a two-tailed test is z = 1.32, what would be the p-value? O .8132 .1868 OO .0934 .9066 O 1.8132 25 1.5 points Suppose we want to estimate the average amount spent on books by freshmen in their first year at a major university. We want to be 96% confident that our estimate will be within $8 of the actual mean. It has been determined from earlier studies that the amount spent has a standard deviation of $35. How many freshmen should be sampled? O 18 O 269 O 9 O 81 O 80 26 1.5 points An economist wanted to estimate the mean expenditure on snacks at movie theaters in a certain city. A random sample of 25 moviegoers revealed a mean amount of $6.25 and a standard deviation in the sample of $0.75. Obtain a 95% confidence interval to estimate the mean amount spent on snacks at theaters in this city. O $5.94