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
= 10 = 4
= 15 = 19
= 89 = 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?