Cincinnati Paint Company sells quality brands of paints through hardware stores throughout the United States. The company maintains a large sales force who call on existing customers and look for new business. The national sales manager is investigating the relationship between the number of sales calls made and the miles driven by the sales representative. Also, do the sales representatives who drive the most miles and make the most calls necessarily earn the most in sales commissions? To investigate, the vice president of sales selected a sample of 25 sales representatives and determined: The amount earned in commissions last month (y) The number of miles driven last month (x1) The number of sales calls made last month (x2)

The London School of Economics and the Harvard Business School have conducted studies of how chief executive officers (CEOS) spend their time. These studies have found that CEOs spend many hours per week in meetings, not including conference calls, business meals, and public events (The Wall Street Journal). Shown below is the time spent per week in meetings (hours) for a sample of 25 CEOS. 20 20 23 15 19 a. What is the least amount of time spent per week on meetings? The highest? 17 - 18 19 - 20 21 22 23 24 Total Prepare a histogram 22 23 14 19 17 Frequency b. Use a class width of two hours to prepare a frequency distribution and a percent frequency distribution for the data. Round your answers to the nearest whole number. If your answer is zero, enter "0". Hours in Meetings per week 11-12 13 - 14 15 - 16 Percent Frequency % % % % 12 % % % % 18 13 15 23 23 17 12 15 19 21 20 12 17 21

The Bureau of Transportation reports on-time performance for airlines at major airports.  JetBlue, United, and US Airways share Terminal C and Boston's Logan Airport. The percentage of on-time flights reported for a sample month were 76.8% for JetBlue, 71.5% for United, and 82.2% for US Airways. Assume that 30% of the arriving flights at this terminal are JetBlue flights, 32% are United flights, and 38% are US Airways flights. a. Develop a contingency table (table of joint probabilities and marginal probabilities). b. An announcement is made that Flight 1382 will arrive at Terminal C. What is the probability that the flight will arrive on time? c. Flight 1382 arrives on time. What is the probability that Flight 1382 is operated by US Airways?  d. Flight 1382 will not arrive on time. What is the probability that Flight 1382 is operated by United?

A simple random sample of 20 paperback novels indicates that they are, on average, 425.1 pages long. Asume that the page count for all paperback novels is Normally distributed, with a standard deviation of 92.8 pages. Calculate a 99% confidence interval for the mean.