Question

According to a study conducted by an​ organization, the proportion of americans who were afraid to fly in 2006 was 0.10. a random sample of 1 comma 1001,100 americans results in 9999 indicating that they are afraid to fly. explain why this is not necessarily evidence that the proportion of americans who are afraid to fly has decreaseddecreased.

Answer 1

Answer:

This is not necessarily evidence that the proportion of Americans who are afraid to fly has  decreaseddecreased  because belowbelow  0.10 because the proportion of sample, is nothing very close to 0.10.

Explanation:

n = 1100

p = 0.10

Using the formula np(1-p), we will have

= 1100(0.10)*(1 - 0.10)

= 1100*0.10*0.90

= 99

99 ≥ 10

This satisfies normal distribution condition. That is, proportion of sample are normally distributed.