M8b



			Name:  _______________________________


1.	Find the 95% confidence interval for the number of heads obtained when 
        tossing a fair coin 100 times.







2.	Suppose thumbtacks have a probability of landing point down 60% and 
        point up 40%.  Give a 99.7% confidence interval for the percent of 
        tacks landing point up when dropping 24 onto the floor.  Give a 99.7% 
        confidence interval for the number of tacks landing point up under the 
        same conditions.








3.	Your machine produces Big Red candy bars with a mean weight of 
        6.58 ozs. and  a standard deviation of .06 ozs.  To keep watch on the 
        machine you carefully check a sample of nine bars every hour.  Find the 
        limits on the mean weight of a sample of nine bars which would indicate 
        that with 95% confidence the machine is out of adjustment.