A Medical Researcher Wondered If There Is a Significant Difference $$\begin{array} { l l l l l l } \text { Boys } & 8.0 & 4.7 & 7.3 & 6.2 & 3.4 \\\text { Girls } & 5.3 & 2.8 & 6.4 & 6.8 & 7.4\end{array}$$

Multiple Choice

A medical researcher wondered if there is a significant difference between the mean birth weight of boy and girl babies. A random sample of babies' weights (pounds) showed the following. $$\begin{array} { l l l l l l } \text { Boys } & 8.0 & 4.7 & 7.3 & 6.2 & 3.4 \\\text { Girls } & 5.3 & 2.8 & 6.4 & 6.8 & 7.4\end{array}$$ How many degrees of freedom would be used to test for a zero difference in means?

A) 4
B) 8
C) 10
D) Must know ? to say.