Hausübung Proseminar

Hallo! Kann mir bitte jemand di lösung für folgendes Beispiel geben:
Kapitel 11 / Nr. 26

A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than taht of decaffeinated-coffee drinkers. A random sample of 50 regular-coffee drinkers showed a mean of 4.35 cups per day, with a standard deviation of 1,2 cups per day. A sample of 40 decaffeinated-coffee drinkers showed a mean of 5,84 cups per day, with a stadard deviation of 1,36 cups per day. Use the .01 significance level. Compute the p-value.

Glaub das Beispiel wär ganz einfach, aber ich checks nicht wirklich!