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_____________________________________________
