SOLUTION: Consider a population proportion p = 0.70. a-1. Calculate the expected value and the standard error of P− with n = 30. (Round "expected value" to 2 decimal places and

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Question 1162760: Consider a population proportion p = 0.70.

a-1. Calculate the expected value and the standard error of P−
with n = 30. (Round "expected value" to 2 decimal places and "standard deviation" to 4 decimal places.)

a-2. Is it appropriate to use the normal distribution approximation for P−
?

Yes
No

b-1. Calculate the expected value and the standard error of P−
with n = 42. (Round "expected value" to 2 decimal places and "standard deviation" to 4 decimal places.)

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
E(X)=np=30*0.70=21
SE=sqrt(p*(1-p)/n)=sqrt(0.21/30)=0.0837
No. n(1-p)=9. Ten is considered the minimum.

n=42, expected value is 42*0.7=29.4
SE=sqrt(0.3*0.7/42)=0.0707