Part $4$: Logistic Regressions

$4\mathrm{.}1[3pt]$ Because the mean tip percentage in the sample is about $17\%,$ we might think that increasing the default tip suggestions from $15,20,$ and $25$ percent to $20,25,$ and $30$ percent would decrease the incidence of riders selecting a default option. Run a logistic regression in which the depenent variable is the default$\_$option and the independent variables are CMT$,$ post$\_$feb, and CMTxpost. At the mean, what was the marginal effect of increasing the default tip suggestions on the probability that a rider would select a default option? Store your answer in the variable effect$\_$on$\_$default$\_$selection as a float. Is the effect statistically significant? Store your answer in the variable stat$\_$sig as either the string "yes" or $"$no$".$

$[]$:

effect$\_$on$\_$default$\_$selection $=$ None

stat$\_$sig $=$ None

# YOUR CODE HERE

raise NotImplementedError$()$

$[]$:

#hidden tests for problem $4\mathrm{.}1$ are within this cell