Question

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 = 4.75, s₁ = .20, n₁ = 15, x¯2x¯2 = 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.

• Do not reject the null hypothesis

• Reject the null hypothesis

(b-1) Comparison of average commute miles for randomly chosen students at two community colleges:

x¯1x¯1 = 25, s₁ = 5, n₁ = 22, x¯2x¯2 = 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¯1x¯1 = 150, s₁ = 2.8, n₁ = 12, x¯2x¯2 = 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.

• Reject the null hypothesis

• Do not reject the null hypothesis

Answer 1