23. Every spring semester, the School of Business coordinates a luncheon with local business leaders for graduating seniors, their families, and friends. Corporate sponsorship pays for the lunches of each of the seniors, but students must purchase tickets to cover the cost of lunches served to guests they bring with them. The following histogram represents the attendance at the senior luncheon, where X is the number of guests each graduating senior invited to the luncheon and f is the number of graduating seniors in each category. 160 T 152 140 - 120 -+ 100 + 85 80 60 + 40 -+ 17 18 20 - W 0 1 Guests per Student 3 Referring to the histogram, graduating seniors attended the luncheon.Click to see additional instructions 22. In a sample. Z scores of absolute value greater than ':I can identify outliers. 21, Which of the following would be an appropriate null hypothesis? A. The mean of a population is equal to 55. B. The mean of a sample is equal to 55. C. The mean ofa population is greater than 55. D. Only (a) and (c) are appropriate. Reset Selection Click to see additional instructions 20' The county clerk wants to estimate the proportion of voters who will need special election facilities. Suppose a sample of 400 voters was taken. If150 need special election facilities, calculate a 90% condence interval for the population proportion. Lower limit =