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a) Use a .05 level of significance to test the claim that the mean amount of tar in filtered king-size cigarettes is less than the mean amount of tar...
a) Use a .05 level of significance to test the claim that the mean amount of tar in filtered king-size cigarettes is less than the mean amount of tar for non-filtered kin-size cigarettes. Assume the variances are different.
Tar(mg) Tar(mg)
Filt nonFilt
n1 = 31 n2 = 35
x1 = 13.3 x2 = 24
s1 = 3.7 s2 = 1.7
claim .................................................... ________________________
null hypothesis........................................ ________________________
alternative hypothesis................................ ________________________
Calculator Screen Name........................... ________________________
test statistic .............................. ________________________
pvalue/alpha comparison............................ ________________________
decision ............................... ________________________
Conclusion ............................... ________________________
b) Construct a 95% confidence interval for µ1 − µ2 . Interpret the interval in a complete sentence.
Confidence Interval Name__________________________________
Interval___________________________________________
Interpret_____________________________________________
