Question

According to a study conducted by a statistical organization, the proportion of Americans who are satisfied with the way things are going in their lives is 0.66.

Suppose that a random sample of 205 Americans is obtained,

a. About 69% of the samples will contain more than x Americans
who are satisfied with their lives. Find the *x*.

b. What is the probability that at least 140 Americans in the sample are satisfied with their lives?

c. What is the probability that 157 or fewer Americans in the sample are satisfied with their lives?

Answer #1

According to a study conducted by a statistical organization,
the proportion of people who are satisfied with the way things are
going in their lives is 0.84. Suppose that a random sample of 100
people is obtained. Complete parts (a) and (b) below.
(a) What is the probability that the
proportion who are satisfied with the way things are going in their
life exceeds 0.88?
The probability that the proportion who are satisfied with the
way things are going in...

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...

According to a study done by Wakefield Research, the proportion
of Americans who can order a meal in a foreign language is 0.47.
Would it be unusual that, in a survey of 200 Americans, 80 or fewer
Americans can order a meal in a foreign language? Justify your
answer. According to a study done by Wakefield Research, the
proportion of Americans who can order a meal in a foreign language
is 0.47. Would it be unusual that, in a survey...

according to a study conducted by CESI Debt Solutions, 80% of
married people hide their purchases from their spouse. in a random
sample of 20 married people, find the probability that fewer than
19 hide their purchases from their spouse
P(X<19)=

Suppose the lengths of pregnancies of a certain animal
are approximately normally distributed with mean ? = 240 days and ?
= 18 days.
a. What is the probability that a randomly selected pregnancy
lasts less than 233 days?
b. Suppose a random sample of 17 pregnancies is obtained.
Describe the mean and standard deviation of the distribution of the
sample mean length of pregnancies.
c. What is the probability that a random sample of 17
pregnancies has a mean...

According to a study conducted in one city, 29% of adults in the
city have credit card debts of more than $2000. A simple random
sample of n=100 adults is obtained from the city. Describe
the sampling distribution of p , the sample proportion of
adults who have credit card debts of more than $2000.
Select one:
a. Approximately normal; μp = 0.29, σp =
0.0021
b. Exactly normal; μp = 0.29, σp =
0.045
c. Binomial; μp = 29,...

1) A study was conducted to determine the proportion of people
who dream in black and white instead of color. Among 323 people
over the age of 55, 66 dream in black and white, and among
281people under the age of 25,15 dream in black and white. Use a
0.05 significance level to test the claim that the proportion of
people over 55 who dream in black and white is greater than the
proportion for those under 25. Complete parts...

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