Three Groups of Individuals Each See an Ad (Labeled Ad1,Ad2,and

Three groups of individuals each see an ad (labeled Ad1,Ad2,and Ad3 below).Consider the responses (shown below)to a question that asks whether a respondent was positive or negative toward the ad viewed. $\begin{array}{llr}\hline \text { Response Options } & \text { Ad 1 } & \text { Ad 2 } & \text { Ad } 3 \\\hline\\\text { Strong positive (1) } & 20\% & 50\%&5\% \\\text { Slight positive ~}(2) & 20 & 0&15 \\\text { Neutral ~~~~~~~~~~~~~} (3) & 20&0&60 \\\text { Slight negative ~}(4) & 20 & 0 &15\\\text { Strong negative }(5) & 20 & 50&5\\\\\text { Mean } & 3.0 & 3.0 & 3.0 \\\hline\end{array}$
The mean on this measure for all three commercials is the same.This means that the standard deviation for all three commercials is also the same.