Question 250898: 8. You are given the following data. Test the claim that there is a difference in the means of the two groups. Use a = 0.05.
Group A Group B
xbar1 = 10 xbar2 = 4
s1 = 15 s2 = 19
n1 = 89 n2 = 69
•State the null and alternate hypotheses
•Determine which test statistic applies, and calculate it
•Determine the critical value(s).
•State your decision: Should the null hypothesis be rejected?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! You are given the following data. Test the claim that there is a difference in the means of the two groups. Use a = 0.05.
Group A Group B
xbar1 = 10 xbar2 = 4
s1 = 15 s2 = 19
n1 = 89 n2 = 69
•State the null and alternate hypotheses
Ho: u1-u2 = 0
H1: u1-u2 is not 0
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•Determine which test statistic applies, and calculate it
I ran a 2-Sample Ttest and got the following:
ts: t = 2.1539
p-value: 0.0331
•Determine the critical value(s).
invT(0.025, df= 126.7287) = +/- 1.9789
•State your decision: Should the null hypothesis be rejected
Since the ts > 1.9789 reject Ho.
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Cheers,
Stan H.
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