Do a two-sample test for equality of means assuming unequal variances. Calculate the p-value using Excel.
(a-1) Comparison of GPA for randomly chosen college juniors and seniors:
x¯1x¯1 = 4.5, s1 = .20, n1 = 15, x¯2x¯2 = 4.9, s2 = .30, n2 = 15, α = .025, left-tailed test.
(Negative values should be indicated by a minus sign. Round down your d.f. answer to the nearest whole number and other answers to 4 decimal places. Do not use "quick" rules for degrees of freedom.)
Find the answers for the follow :
D.F?
t-CALCULATED ?
P-VALUE ?
T-critical?
(a-2) Based on the above data choose the correct decision.
multiple choice 1
Reject the null hypothesis
Do not reject the null hypothesis