4 because 2.5+2.5=5 and another 2.5+2.5=5
now 5+5=10
Answer:
a) The estimated standard deviation of the sampling distribution of the proportion is 0.023
b) the estimated standard deviation have been if he had surveyed only 100 customers is 0.046
Step-by-step explanation:
given information:
the number of sample, n = 400
sample proportion, p = 70% = 0.7
a) standard deviation of a sample proportion is
σ = 
= 
= 0.023
b) if n = 100, so
σ = 
= 
= 0.046
28 divided by 3658 is .007654456
186.99999992 and that is the correct anwser i think