2 problems: 1) Two tailed difference between means 2) 90 % confidence interval

4)
An office manager wishes to see whether the typing speed of 10
secretaries can be increased by changing over to computers. The number of words typed per minute is given here at @=0.10 is there enough evidence to conclude that by using computers the secretaries can type more words  per minute. Show all the work

Secretary       Typewriter           Computer
1                  63                  68
2                  72                  80
3                  85                  95
4                  97                  93
5                  82                  80
6                  101                106
7                  73                  82
8                  62                  78
9                  58                  65
10                 75                  83

5)
In a sample of 200 surgeons 15% thought the government should control health care. In a sample of 200 general practitioners 21% felt this way. At @=0.10 is there a difference in the proportions. Find 90% confidence interval for the difference of the two proportions. Show all the work.

Attached file(s):

stats2.doc  View File