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2. The following sample observations were randomly selected. DATA FILE, please visit 5 13 15 12 13 11 w.mhhe.com/lind16e Determine the correlation coefficient and interpret the relationship between x and y. 3. Bi-lo Appliance Super-Store has outlets in several large metropolitan areas in New England The general sales manager aired a commercial for a digital camera on selected local ATA FILE, please visit stations prior to a sale starting on Saturday and ending Sunday. She obtained the informa hhe.com/lind16e tion for Saturday-Sunday digital camera sales at the various outlets and paired it with the number of times the advertisement was shown on the local TV sta TV stations. The purpose is to find whether there is any relationship between the number of times the advertisement was aired and digital camera sales. The pairings are: Location of Number of Saturday-Sunday Sales TV Station Airings ($ thousands) Providence 15 Springfield 8 New Haven 21 OUIN Boston 24 Hartford 17 a. What is the dependent variable? b. Draw a scatter diagram. c. Determine the correlation coefficient. d. Interpret these statistical measures. 4. The production department of Celltronics International wants to explore the relationship between the number of employees who assemble a subassembly and the numb duced. As an experiment, two employees were assigned to assemble the subassemblies. amber pro- please visit n/lind16e They produced 15 during a one-hour period. Then four employees assembled them. They produced 25 during a one-hour period. The complete set of paired observations follows. One-Hour Number of Production Assemblers (units) 15 25 10 40 30 The dependent variable is production; that is, it is assumed that different levels of produc- tion result from a different number of employees. a. Draw a scatter diagram. b. Based on the scatter diagram, does there appear to be any relationship between the number of assemblers and production? Explain. c. Compute the correlation coefficient. 5. The city council of Pine Bluffs is considering increasing the number of police in an effort to reduce crime. Before making a final decision, the council asked the chief of police to sur- vey other cities of similar size to determine the relationship between the number of police and the number of crimes reported. The chief gathered the following sample information. City Police Number of Crimes City Police Number of Crimes Oxford 15 17 Starksville Holgate 17 17 13 Danville Carey 21 25 12CHAPTER 13 ERCISES 7. The following hypotheses are given. Hoipso Hip >o A random sample of 12 paired observations indicated a correlation of .32. Can we conclude that the correlation in the population is greater than zero? Use the .05 significance level. 8. The following hypotheses are given. Hoi p 20 Hip