homework #12 section 7.1 #4 parts a, b and c section 7.2 #20

4.

a. ( ) ( )5.59,1.5718.13.58

25396.13.58 ==

b.( ) ( )9.58,7.5759.3.58

100396.13.58 ==

c. ( ) ( )1.59,5.5777.3.58

100358.23.58 ==

20. Because the sample size is so large, the simpler formula (7.11) for the confidence interval for p is sufficient. Use of the more complicated version would give the same result when rounded off to three decimal places.

( )( ) ( )163,.137.013.15.4722

85.15.58.215. ==