Consider the following hypothesis statement using ?=0.05 and data from two independent samples. Assume the population variances are not equal and the populations are normally distributed.
Upper H0: ?1??2?0
x overbar 1=150.0
x overbar 2=150.5
Upper 0H1: ?1??2<0
s1=17.1
s2=28.3
n1=26
n2=18
The test statistic is
The critical value is
The P-value is





