The inhabitants of one town would like to have a factory closed ...

[londonang]

The inhabitants of one town would like to have a factory closed down due to the pollution that it causes. A researcher wants to determine the proportion of children living in the vicinity of this factory that suffer from asthma.
 
  Obtain a sample size that will ensure a margin of error of at most 0.007 for a 99 confidence interval. From a previous study, an estimate of the proportion of children suffering from asthma amongst those living in the vicinity of this factory, is 0.168.
  A) 18,914 B) 132 C) 10,958 D) 17,023

Question 2

On a multiple choice test with 15 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the standard deviation for the random variable X, the number of correct answers.
 
  A) 1.62 B) 1.643 C) 1.677 D) 1.587

[Swizqar]

Answer to Question 1

A

Answer to Question 2

C

[londonang]

Excellent

[peter]

Gracias!