Question $2$: chickenpox$\_$by$\_$sex$()$

It would be interesting to see if there is any evidence of a link between vaccine effectiveness and sex of the child. Calculate the ratio of the number of children who contracted chickenpox but were vaccinated against it $($at least one varicella dose$)$ versus those who were vaccinated but did not contract chicken pox. Return results by sex.

This function should return a dictionary in the form of $($use the correct numbers$)$:

$\}$

$\{$ female: $0\mathrm{.}4$

Note: To aid in verification, the chickenpox$\_$by$\_$sex$()[\text{'}$female$\text{'}]$ value the autograder is looking for starts with the digits $0\mathrm{.}00779.$