Consider an experiment in which adult laboratory mice were fed one of three diets: high fat, low fat, and a control diet. The mice were weighed, received these diets for 2 weeks, and then were weighed again. The table below shows the results of the experiment.

$\begin{array}{|l|l|l|}\hline \text { Diet } & \text { Gained weight } & \text { Lost weight } \\\hline \text { High Fat } & 79 & 21 \\\hline \text { Low Fat } & 30 & 69 \\\hline \text { Control } & 70 & 30 \\\hline\end{array}$
-To determine whether there appears to be a statistically significant relationship between diet and weight gain or loss we would conduct a ?² analysis. When performing this analysis, which of the values below is closest to the number of degrees of freedom we would use?

Question

Consider an experiment in which adult laboratory mice were fed one of three diets: high fat, low fat, and a control diet. The mice were weighed, received these diets for 2 weeks, and then were weighed again. The table below shows the results of the experiment.

\begin{array}{|l|l|l|}\hline \text { Diet } & \text { Gained weight } & \text { Lost weight } \\\hline \text { High Fat } & 79 & 21 \\\hline \text { Low Fat } & 30 & 69 \\\hline \text { Control } & 70 & 30 \\\hline\end{array}

-To determine whether there appears to be a statistically significant relationship between diet and weight gain or loss we would conduct a ?² analysis. When performing this analysis, which of the values below is closest to the number of degrees of freedom we would use?

Quizplus · Accepted Answer

The number of degrees of freedom for a chi-square analysis is (r-1) x (c-1), where r is the number of rows and c is the number of columns. In this case, there are 3 rows and 2 columns, so the number of degrees of freedom is (3-1) x (2-1) = 2.

Consider an Experiment in Which Adult Laboratory Mice Were Fed