Question

4) To estimate the population proportion of a given survey, what sample size would be required if we want a margin of error of 0.045; a confidence level of 95%; and p and q are unknown.

5). How many cars must be randomly selected and tested in order to estimate the mean braking distance of registered cars in the US? We want a 99% confidence that the sample mean is within 2 ft of the population mean, and the population standard deviation is known to be 7 ft.

6) In a Pew Research Center poll of 745 randomly selected adults, 589 said that it is morally wrong to not report all income on tax returns. Construct a 95% confidence interval estimate of the proportion of all adults who have that belief. Write a statement interpreting the confidence interval.

Answer #1

4)

Here, ME = 0.045

z value at 95% = 1.96

p= 0.5

ME = z *sqrt(p*(1-p)/n)

0.045 = 1.96 *sqrt(0.5 *(1-0.5)/n)

n = ( 1.96/0.045)^2 * 0.5*(1-0.5)

n = 474

5)

ME = 2 , s = 7

z value at 99% = 2.576

ME = z *(s/sqrt(n))

2 = 2.576 *(7/sqrt(n))

n = (2.576 * 7/2)^2

n = 81

6)

p = 589/745 = 0.791

z value at 95% =1.96

CI = p+/- z *sqrt(p*(1-p)/n)

= 0.791 +/- 1.96 *sqrt(0.791*(1-0.791)/745)

= (0.7614 , 0.8198)

we are 95% confident that the proportion of all adults who have
that belief. is between (0.7614 , 0.8198)

In a Pew Research Center poll of 745 randomly selected adults,
589 said that it is morally wrong to not report all income on tax
returns.
a. Construct a 95% confidence interval estimate of the
percentage of all adults who have that belief, and then write a
statement interpreting the confidence interval.
76.1% - 82%
b. Assume that you must conduct a new poll to determine
the percentage of adults who believe that it is morally wrong to
not...

Use the given information to find the minimum sample size
required to estimate an unknown population mean μ.
How many students must be randomly selected to estimate the mean
weekly earnings of students at one college? We want 95% confidence
that the sample mean is within $5 of the population mean, and the
population standard deviation is known to be $60.

Use the given information to find the minimum sample size
required to estimate an unknown population mean
muμ.
How many students must be randomly selected to estimate the mean
weekly earnings of students at one college? We want 95%
confidence that the sample mean is within
$22
of the population mean, and the population standard deviation
is known to be
$4343.
A.
1 comma 7761,776
B.
2 comma 5102,510
C.
1 comma 5651,565
D.
1 comma 251

Use the given information to find the minimum sample size
required to estimate an unknown population mean μ.
How many women must be randomly selected to estimate the mean
weight of women in one age group. We want 90% confidence that the
sample mean is within 2.0 lb of the population mean, and the
population standard deviation is known to be 27 lb.

1. When constructing a confidence interval to estimate a
population proportion, what affects the size of the margin of
error?
A. The sample size
B. The sample proportion
C. The confidence level
D. All of the above affect the size of the margin of error
E. None of the above affect the size of the margin of error
2. What percentage of couples meet through online dating
apps? A survey of a random sample of couples finds that 12% say...

In a pew research center poll of 745 randomly selected adults,
589 said it is morally wrong not to report all income on tax
returns. Use a .01 significance level to test the claim that 75% of
adults say that it is morally wrong not to report all income on the
returns.
Question 3: Which command in stat crunch do you use
here?
A. Z Stats
B. T stats
C. Proportion stats
D. Variance Stats
Question 4: What is the...

Let's say we want to estimate the population proportion of a
population. A simple random sample of size 400 is taken from the
population. If the sample proportion is 0.32:
1) what is the point estimate of the population proportion?
2) At the 95% level of confidence, what is the margin of
error?
3) Based on 2) what is a confidence interval at the 95%
confidence level?
4) What is the margin of error if the level of confidence is...

Explain how an interval estimate is more informative than a
point estimate by solving the following, providing the TI commands,
and comparing the two. When asked if marriage is becoming obsolete,
782 out of 2004 randomly selected adults who responded to a 2010
Pew Poll said yes. Find the point estimate for the percentage of
adults who said yes, then find a 95% confidence interval for the
proportion of adults who said yes

Explain how an interval estimate is more
informative than a point estimate by solving the following,
providing the TI commands, and comparing the two. When asked if
marriage is becoming obsolete, 782 out of 2004 randomly selected
adults who responded to a 2010 Pew Poll said yes. Find the point
estimate for the percentage of adults who said yes, then find a 95%
confidence interval for the proportion of adults who said yes.
Can you please use the 1PropZInt...

Determine the required sample size to estimate
a population proportion with a Confidence Level of 95% and E =
0.084.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 8 minutes ago

asked 8 minutes ago

asked 8 minutes ago

asked 8 minutes ago

asked 9 minutes ago

asked 10 minutes ago

asked 21 minutes ago

asked 28 minutes ago

asked 30 minutes ago

asked 37 minutes ago

asked 45 minutes ago