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3. do a twosample test for equality of means assuming unequal...

# Question: do a twosample test for equality of means assuming unequal...

###### Question details
 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⎯⎯1x1 = 4.75, s1 = .20, n1 = 15, x⎯⎯2x2 = 5.18, 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.)
 d.f. t-calculated p-value t-critical
(a-2) Based on the above data choose the correct decision.
 Reject the null hypothesis Do not reject the null hypothesis
 (b-1) Comparison of average commute miles for randomly chosen students at two community colleges: x⎯⎯1x1 = 25, s1 = 5, n1 = 22, x⎯⎯2x2 = 33, s2 = 7, n2 = 19, α = .05, two-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.)
 d.f. t-calculated p-value t-critical +/-
(b-2) Based on the above data choose the correct decision.
 Reject the null hypothesis Do not reject the null hypothesis
 (c-1) Comparison of credits at time of graduation for randomly chosen accounting and economics students: x⎯⎯1x1 = 150, s1 = 2.8, n1 = 12, x⎯⎯2x2 = 143, s2 = 2.7, n2 = 17, α = .05, right-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.)
 d.f. t-calculated p-value t-critical
(c-2) Based on the above data choose the correct decision.
 Do not reject the null hypothesis Reject the null hypothesis