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# Coal comdany wanis determine 9596 confidence interval estimate for the average daily tonnage ol coal Inal [nnks Assuming Ire cornpany reporls Inat Ihe staridard dev...

## Question

###### Coal comdany wanis determine 9596 confidence interval estimate for the average daily tonnage ol coal Inal [nnks Assuming Ire cornpany reporls Inat Ihe staridard devialion al dally output 200 tons; hov many days should sampic S0 tnat thc margin of crror bo 39. tons less?Filty students AA nralla fconamics dasc Aller Ine (Irsi Pssa eramnalan rhndoa sampic five papcrs was sclcctcd. Tho gradcs wcrc 60, 75, 80, 70,and 90. If thorc wero 200 students the class, what iould be the 90%0 contidence interval

coal comdany wanis determine 9596 confidence interval estimate for the average daily tonnage ol coal Inal [nnks Assuming Ire cornpany reporls Inat Ihe staridard devialion al dally output 200 tons; hov many days should sampic S0 tnat thc margin of crror bo 39. tons less? Filty students AA nralla fconamics dasc Aller Ine (Irsi Pssa eramnalan rhndoa sampic five papcrs was sclcctcd. Tho gradcs wcrc 60, 75, 80, 70,and 90. If thorc wero 200 students the class, what iould be the 90%0 contidence interval for the mean grade al the students the class? 1057 6331 86.01 65.22 t0 34.55 783 85,217 234 64.34 t0 85.56 enouah intormannn ceiemine Question 1.25 pts Question 2 "25 pts pesparcner intetested determining the average numner of years employees company with the company: past inormnaticn Ghous siangard deviaton months; what size sample should bc sclected 50 that at 9580 confidence thc margin etor will be months lcss? The monthly starting salaries of students who receive an MBA degree have standard deviation of S110. What size sarple should selected I0 Oblain 95 probability estimating Ihe Iean monthly incomc within S20 Icss? 1058

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