Question: You are given the following data. Test the claim that there is a difference in the means of the two groups. Use = 0.05.
Group A           Group B
= 2 = 5
= 19 = 18
= 31 = 49

 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?

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