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Chapter 9: Q.95 (page 592)

Sampling shoppers A marketing consultant observes 50 consecutive shoppers at a supermarket, recording how much each shopper spends in the store. Explain why it would not be wise to use these data to carry out a significance test about the mean amount spent by all shoppers at this supermarket.

Short Answer

Expert verified

Convenience sample.

Step by step solution

01

Step-1 Given Information

Given in the question that, A marketing consultant observes 50consecutive shoppers at a supermarket, we have to Explain why it would not be wise to use these data to carry out a significance test about the mean amount spent by all shoppers at this supermarket.

02

Step-2 Explanation

A convenient sample is a non-probability sampling method in which the sample is taken from a group of people who are easy to touch or encounter. A convenience survey, for example, would entail standing outside a mall or a grocery store and asking customers to complete questionnaires. This kind of sampling is also known as grab sampling or availability sampling. The poll is a choice study, as the shoppers were chosen because they were "conveniently" consecutive.

There would also be shoppers who went shopping on the same day of the week and at the same time, implying that a segment of the population was left out.

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Most popular questions from this chapter

We want to be rich In a recent year, 73 % of first-year college students responding to a national survey identified "being very well-off financially" as an important personal goal. A state university finds that 132 of an SRS of 200 of its first-year students say that this goal is important. Is there good evidence that the proportion of all first-year students at this university who think being very well-off is important differs from the national value, 73 %? Carry out a test at the 伪=0.05 significance level to help answer this question.

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Does Friday the 13thhave an effect on people's behavior? Researchers collected data on the numbers of shoppers at a sample of 45different grocery stores on Friday the 6thand Friday the 13thin the same month. The dotplot and computer output below summarize the data on the difference in the number of shoppers at each store on these two days (subtracting in the order 6thminus 13th).

Researchers would like to carry out a test of H0:渭d=0versus H伪:渭d鈮�0, where 渭dis the true mean difference in the number of grocery shoppers on these two days. Which of the following conditions for performing a paired ttest is not met?

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