A Statistician Is Being Asked to Test a New Theory

Multiple Choice

A statistician is being asked to test a new theory that the proportion of population A possessing a given characteristic is greater than the proportion of population B possessing the characteristic.A random sample of 600 from population A has been taken and it is determined that 480 possess the characteristic.A random sample of 700 taken from population B showed that 350 possess the characteristic.The observed z for this is ___.

A) 0.300
B) 0.624
C) 0.638
D) 11.22
E) 13.42