Consider the following hypothesis statement using alpha equals=0.01 and data from two independent samples. Assume the population variances are not equal and the populations are normally distributed. Complete parts a and b.
H0: ?1??2=0
H1: ?1??2?0
x overbar 1=115.3 x overbar 2=122.0
s1=25.1 s2=15.3
n1=15 n2=18
The test statistic is
The critical value is
?
the p-value is





