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.
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A.This is not necessarily evidence that the proportion of Americans who are afraid to fly has
decreaseddecreased
belowbelow
0.10 because the probability of obtaining a value equal to or more extreme than the sample proportion is
nothing,
which is not unusual.
(Round to four decimal places as needed.)
B.This is not necessarily evidence that the proportion of Americans who are afraid to fly has
decreaseddecreased
belowbelow
0.10 because the sample size n is more than 5% of the population.
C.This is not necessarily evidence that the proportion of Americans who are afraid to fly has
decreaseddecreased
belowbelow
0.10 because the sample proportion,
nothing,
is very close to 0.10.
(Type an integer or a decimal.)
D.This is not necessarily evidence that the proportion of Americans who are afraid to fly has
decreaseddecreased
belowbelow
0.10 because the value of
np(1minus−p)
is less than 10.
option B is correct
it is given that n = 1100 and p = 0.10
this gives us np(1-p) = 1100*0.10*(1-0.10)
= 1100*0.1*0.9
= 99 greater than or equal to 10
So,condition for normal distribution is satisfied.
so, we can say that the sample proportion is normally distributed
B.This is not necessarily evidence that the proportion of Americans who are afraid to fly has
decreaseddecreased
belowbelow
0.10 because the sample size n is more than 5% of the population.
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