A city wants to know if a new advertising campaign to make citizens aware of the

Question

A city wants to know if a new advertising campaign to make citizens aware of the dangers of driving after drinking has been effective. The accompanying table shows the number of drivers who have been stopped with more alcohol in their systems than the law allows for each day of the week in the week before and the week a month after the campaign starts. Assume that the data from each population is Normally distributed. Complete parts a through i below. Click the icon to view the counts of stopped drivers. a) Are the data paired? Explain. Choose the correct answer below. A. No, they are not paired because the drivers are independent of each other. B. Yes, because the before counts were compared to the counts after the advertisement. C. Yes, because each day of the week was compared before and after the advertisement. b) Compute the mean difference. Find the mean difference of (before - after) d = drivers (Round to three decimal places as needed.)

Explanation / Answer

We say a set of bivariate sample as paired when two different measures has been taken on a same group of individuals. That is, the units in the sample to be considered are fixed, it is only the fact that two different characteristics we are considering on them. Now, here, in two different weeks, one before advertisement and one after advertisement, the set of drivers in the first set are different from those in second set. So, it is not on same set of individuals. i.e the drivers are independent of each other. So by option (a) the data is not paired.

b) To get the answer of (b) you need give the count of stopped drivers. Calculate the mean of number of drivers of all days in both the weeks and then calculate the difference. Which will be the answer

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