Use SolverTable on the solved problem to identify changes in interview types and total cost for changes in the number of total interviews required. Rationale: accuracy and precision requirements for the marketing research results will be determined by a statistically determined sample size. For a variety of sample sizes, the marketing research study may vary greatly in terms of types of interviews and total cost.

 

Marketing Research Model Knoxville Survey Corp. has been hired to conduct door-to-door personal interviews to obtain information from both households with and without children. In addition, both day and evening interviews are deemed necessary in order to allow for a variety of household work schedules. The firm must conduct 1,000 interviews under the following guidelines: At least 400 households with children will be interviewed. At least 400 households without children will be interviewed. The total number of evening interviews will be at least as great as the total number of day interviews. At least 40% of interviews for households with children will be conducted during the evening. At least 60% of interviews for households without children will be conducted during the evening. Interview costs are $20 for children-day, $25 for children-evening, $18 for no children-day, and $20 for no children-evening. How many interviews of each type should be made? Interview Costs and Definition Interview Schedule 160 360 240 240 Costs $25 $20 $20 $18 Interview Guideline Compliance Interviews Scheduled 400 600 520 CE 160 NE 360 Total 1000 N Type CE NE CD ND ZE >= >= x= >= X = 400 400 480 Key C = household with children N = household without children D = daytime interview E = evening interview Minimum Required Minimum Required D 160.0 40% 360.0 60% 1000 Total Required Limit on C Limit on N Total Project Cost 20,320