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".