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 inde- pendent 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 satis- fied." 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

1) Single sample, we want to estimate the average age of the stores customers. Estimate only one variable.

2) matched pairs, here there are two opinion on same data i.e. very dissatisfied and very satisfied.

3) two independent samples., here two seperate opinion on two sepearte data set.

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