6 a) Test the claim that Brand Z and Brand W have the different means. Use the .04 level. Assume the variances are different and the populations normal. Brand Z Brand W n = 25 12 = 50 * = 87.3 *2 = 81.8 S1 = 7.4 $2 = 1 1.9 claim . . . . . null hypothesis... alternative hypothesis... Calculator Screen Name. ........ test statistic . . . . . . . . ...... pvalue/alpha comparison.. . . . . decision Conclusion . . . b) Construct a 96% confidence interval for M - M2 . Interpret the interval in a complete sentence. Confidence Interval Name Interval Interpret