Question: Survival on the Titanic, one more time. In Exercise you could have checked for a difference in the chances of survival for men and women using two-proportion z procedures.
a) Find the z value for this approach.
b) Show that the square of your calculated value of z is the value of you calculated in Exercise.
c) Show that the resulting P-values are the same.
Exercise: Titanic, redux. Newspaper headlines at the time, and traditional wisdom in the succeeding decades, have held that women and children escaped the Titanic in greater proportions than men. Here's a table with the relevant data. Do you think that survival was independent of whether the person was male or female? Defend your conclusion.
