If the following age groups are included in the proportions indicated, how many of each age group should be included in a sample of 3,000 people to make the sample representative?
State University has three campuses, each with its own business school. Last year, State’s business professors published numerous articles in prestigious professional journals, and the board of regents counted these articles as a measure of the productivity of each department
A reporter wants to know how the cost of compliance with the Americans with Disabilities Act (ADA) has affected national hiring practices and sends out a form letter to 2,000 businesses in the same ZIP code as the magazine’s editorial offi ces. A total of 880 responses are received. Comment on the data available in these responses in terms of the five tests for data
The following relative frequency distribution resulted from a study of the dollar amounts spent per visit by customers at a supermarket:
The following responses were given by two groups of hospital patients, one receiving a new treatment, the other receiving a standard treatment for an illness. The question asked was, ‘‘What degree of discomfort are you experiencing?’
The head of a large business department wanted to classify the specialties of its 67 members. He asked Peter Wilson, a Ph.D. candidate, to get the information from the faculty members’ publications. Peter compiled the following:
Lesley Niles, a summer intern at the Internet Financial Services Corporation, has been asked to investigate the low participation rates in the company’s 401(k) investment program. Niles read an article in The Wall Street Journal commenting on families’ second wage-earner income as a determinant of plan participation. Niles went from office to office and interviewed executives eligible to participate. None of the executives reported a spouse with second income over $35,000 and many families had no second income. To examine the situation, Niles decides to construct both frequency and relative frequency distributions.
The Kawahondi Computer Company compiled data regarding the number of interviews required for each of its 40 salespeople to make a sale. Following are a frequency distribution and a relative frequency distribution of the number of interviews required per salesperson per sale. Fill in the missing data.
A. T. Cline, the mine superintendent of the Grover Coal Co., has recorded the amount of time per workshift that Section Crew #3 shuts down its machinery for on-the-spot adjustments, repairs, and moving. Here are the records for the crew’s last 35 shifts:
Cline has obtained information on Section Crew #3’s coal production per shift for the same 35-shift period discussed in Exercise 2-69. The values are in tons of coal mined per shift: