A) The following results come from two independent samples taken from two populations.

We would like to test H0: 12=0,=0.05

sample 1	sample 2
n1 = 31	n2 = 38
x1= 23.49	x2=22.5
s1 = 3.79	s2 = 6.23

Assume the variances are UNEQUAL. Calculate the test statistic.

Round your final answer to two decimal places, including the zero and the MINUS sign before the decimal place if needed. E.g., -0.12.

B)The following results come from two independent samples taken from two populations.

sample 1	sample 2
n1 = 44	n2 = 37
x1= 20	x2=23
s1 = 2.94	s2 = 7.95

Assume the variances are UNEQUAL. Calculate the standard error.

Round your final answer to two decimal places, including the zero before the decimal place if needed. E.g., 0.12.