7.120 Which design? The following situations all require inference about a mean

Question

7.120 Which design? The following situations all require inference about a mean or means. Identify each as (1) a single sample, (2) matched pairs, or (3) two independent samples. Explain your answers.

(a) You want to estimate the average age of your store’s customers.

(b) You do an SRS survey of your customers every year. One of the questions on the survey asks about customer satisfaction on a seven-point scale with the response 1 indicating “very dissatisfied” and 7 indicating “very satisfied.” You want to see if the mean customer satisfaction has improved from last year.

(c) You ask an SRS of customers their opinions on each of two new floor plans for your store.

Explanation / Answer

a. In first one we are finding average of customers from same shop so it's single sample.

b. This is also done on same store so again single sampling.

C. Two new floors are independent so it's two independent samples

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