An employment agency wants to see which of three types of ads in the helpwanted section of local newspapers is the most effective.

Three types of ads (big headline, straightforward, and bold print) were randomly alternated over a period of weeks, and the number of people responding to the ads was noted each week. Do these data support the null hypothesis that there is no difference in the effectiveness of the ads, as measured by the mean number responding, at the 0.01 level of significance?

Type of Advertisement Big Headline Straightforward Bold Print Number of responses (replicates) 23 19 28 42 31 33 36 18 46 48 24 29 33 26 34 26 34

a. Solve using the p-value approach.

b. Solve using the classical approach.