SOLUTION: The City of St. Pete claims that 4% of the locals are unemployed. We sample 400 people and find 22 are unemployed. Find the z-score used in hypothesis testing. (I generally call th

Algebra ->  Probability-and-statistics -> SOLUTION: The City of St. Pete claims that 4% of the locals are unemployed. We sample 400 people and find 22 are unemployed. Find the z-score used in hypothesis testing. (I generally call th      Log On


   

Question 467826: The City of St. Pete claims that 4% of the locals are unemployed. We sample 400 people and find 22 are unemployed. Find the z-score used in hypothesis testing. (I generally call this the "standardized test statistic")
A. -1.531
B. 1.531
C. 0.1
D. 0.015
E. not enough information is given.


Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
B. 1.531
z+=+%28X+-+p%29%2Fsqrt%28%28pq%29%2Fn%29
Try X = 22/400 = 0.055, p = 0.04, q = 0.96, and n = 400.