A Researcher Wants to Determine Whether There Is a Difference

Essay

A researcher wants to determine whether there is a difference between two sunscreen lotions. Participants in amarathon race on a hot, sunny day applied lotion A to one arm and lotion B to the other arm. The results areshown in the table. $\begin{array}{cr|cc} & & \text { Lotion A } \\& & \text { No burn (Success) } & \text { Burn (Failure) } \\\hline & \text { No burn (Success) } & 720 & 41 \\ \text { Lotion B }\\& \text { Burn (Failure) } & 51 & 74\end{array}$
Is there a difference in the effectiveness of the two lotions in preventing sunburn? Use the critical-valuemethod and the α = 0.05 level of significance.