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In: Statistics and Probability

Do a two-sample test for equality of means assuming unequal variances. Calculate the p-value using Excel....

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

Solutions

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