Exercises in Sample Design In each of the following situations, make recommendat

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Exercises in Sample Design

In each of the following situations, make recommendations as to the type of sample to be used, the method of selecting the sample, and the sample size.

For each scenario, you need to clearly and specifically indicate how the respondents in each sample will be identified and selected. In some of the scenarios, the sample size is indicated; in others, it is not and you will need to specify the size. (Do NOT focus on how the data will be collected.)

1. The manager of the appliance department of a local full-line department store chain is planning a major one-day nonprice promotion of food processors, supported by heavy advertising in the two local newspapers. The manager asks you to recommend a method of sampling customers coming into the department. The purpose is to assess the extent to which customers were drawn by the special advertisement, and the extent to which the advertisement influenced their intentions to buy. A pretest of the questionnaire indicates that it will take about 3 minutes to administer. The manager is especially interested in learning whether there are significant differences in the response to the questionnaire among (a) males versus females, (b) gift buyers versus other buyers, and (c) age groups.

2.A major airline wants to run a preliminary study on the attitudes of university students toward air travel. The company’s research director already has submitted an interview plan and has estimated that, on average, each interview will require between an hour and an hour-and-a-half to administer. It is estimated that the cost of interviewing and interpreting the interview will be roughly $75.00 per respondent.

Explanation / Answer

For this scenario, a random sampling technique would be the best option. A systematic approach can be applied to choose the random sampling. For example, every 5th customer who comes into the store can be selected for the sample and a total sample size can be around 150 customers. The sample size of 150 customers for the appliance department is a considerable size for analyzing if there are any differences in response to the questionnaire among (a) males versus females, (b) gift buyers versus other buyers, and (c) age groups. The systematic random sampling size provides a systematic approach for the process. Quota sampling is a non-probability sampling method. In the given scenario, the university students are the selected quota or stratum. Then, judgment or convenience sampling methods can be chosen to select the required number of students to be interviewed from the stratum. For example, the number of university students to be interviewed can range from 50-100 students considering the cost $75 which is quite a high amount.

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