D2L Assignment_4 X D2L Homepage - N X D2L Assignment # X D2L Week 11 - Tear X D2L Outline - F22 - X G Mark Calculate X G Plan & Schedul x Home | Micros X W HTM2220 - W X + C courselink.uoguelph.ca/d21/le/content/771313/viewContent/3331212/View *0 Update : ASSignmen 4 W KY 1 of 3 - + Automatic Zoom > > E 8 Exercise 1: Some fast-food chains offer a lower-priced combination meal in an effort to attract budget-conscious customers. One chain test-marketed a burger, fries, and drink combination for $4.71. The weekly sales volume for these meals was impressive. Suppose the chain wants to estimate the average amount its customers spent on a meal at their restaurant while this combination offer was in effect. An analyst gathers data from 28 randomly selected customers. The following data represent the sample meal totals. $6.21 $8.40 $6.50 $7.39 $8.60 $11.65 $8.02 $7.20 $4.25 $10.64 6.28 6.57 6.26 6.80 8.46 12.87 7.67 8.86 6.73 7.08 8.47 7.49 8.19 8.82 10.62 7.83 11.42 12.10 Use these data to construct a 90% confidence interval to estimate the population mean value. Assume the amounts spent are normally distributed. Exercise 2: 1. What proportion of commercial airline pilots are more than 40 years of age? Suppose an analyst has access to a list of all pilots who are members of the Air Line Pilots Association. If this list is used as a frame for the study, she can randomly select a sample of pilots, contact them, and ascertain their ages. From 89 of these pilots so selected, she learns that 48 are more than 40 years of age. Construct an 85% confidence interval to estimate the population proportion of commercial airline pilots who are more than 40 years of age. 2. Suppose you want to estimate the proportion of cars that are sport utility vehicles (SUVs) being driven in Regina at rush hour by standing on the corner of Victoria Avenue and Albert Street and counting SUVs. You believe the figure is no higher than 0.40. If you want the error of the confidence interval to be no greater than 0.03, how many cars should you randomly sample? Use a 90% level of confidence