And did you find out how many of the up and neutral clients also came from the yellow pages? That bit of information is useful only if it draws a distinction, e.g. what if the agency only had one working form of advertising?
(Of course this almost goes without saying, and I don't doubt you thought of it, but this is such a common logic error that I thought it shouldn't be left hanging in a public forum.)
(Of course this almost goes without saying, and I don't doubt you thought of it, but this is such a common logic error that I thought it shouldn't be left hanging in a public forum.)