SOLUTION: Doctors believe that 70% of a certain type of operation are successful nationally. In a particular hospital, 50 of these operations were observed and 31 of them were successful.

Question 1178195:
Doctors believe that 70% of a certain type of operation are successful nationally. In a particular hospital, 50 of these operations were observed and 31 of them were successful. At a=0.05 is this hospital’s success rate different from the national average?
a.Yes because the z score of - 1.234 is inside the rejection region
b.No because the z score of - 1.234 is outside the rejection region
c.No because the z score of - 1.165 is outside the rejection region
d.Yes because the z score of - 1.165 is inside the rejection region

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

Ho:  p = .7

Ha:  p < .7

sample:  n = 50 mean = 31/50 =  .62

Ïƒ = 0.05, 0r  .95 (z = 1.96) 

  = -1.234

|-1.234| < 1.96

Is this hospital’s success rate different from the national average?

(Reject Ho?)

b. No because the z score of - 1.234 is outside the rejection region

Wish You the Best in your Studies.

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