Question

Salaries of 4747 college graduates who took a statistics course in college have a mean, x overbarx, of $63,000. Assuming a standard deviation, sigmaσ, of $16 comma 37216,372, construct a

9090% confidence interval for estimating the population mean μ.

(Round to the nearest integer as needed.)

Answer #1

Solution :

Given that,

Point estimate = sample mean = = 63000

Population standard deviation = = 16372

Sample size = n = 47

Z_{/2}
= 1.645

Margin of error = E = Z_{/2}*
(
/n)

= 1.645 * (16372 / 47)

= 3928

At 90% confidence interval estimate of the population mean is,

- E < < + E

63000 - 3928 < < 63000 + 3928

59072 < < 66928

**(59072 , 66928 )**

Salaries of 45 college graduates who took a statistics course in
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Salaries of 47 47 college graduates who took a statistics course
in college have a mean, x overbar x, of $ 63 comma 400 $63,400.
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population mean mu μ.

Salaries of 34 college graduates who took a statistics course in
college have a mean, x overbar, of $ 68 comma 500. Assuming a
standard deviation, sigma, of $12 comma 046, construct a 99%
confidence interval for estimating the population mean mu. Click
here to view a t distribution table.LOADING... Click here to view
page 1 of the standard normal distribution table.LOADING... Click
here to view page 2 of the standard normal distribution
table.LOADING... $ nothingless than muless than$ nothing...

Salaries of 44 college graduates who took a statistics course in
college have a mean,xbar,of $63,600.Assuming a standard
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____< mu<____

Salaries of 48 college graduates who took a statistics course in
college have a mean, x of $ 60,700. Assuming a standard
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a t distribution table. LOADING... Click here to view page 1 of the
standard normal distribution table. LOADING... Click here to view
page 2 of the standard normal distribution table. LOADING... $
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Question 3 4 pts
A sample of salaries of 57 college graduates who took a
statistics course in college have a mean of $78,829 and a
standard deviation of $10,086. Construct a 91% confidence
interval for estimating the population mean.

Starting salaries of 64 college graduates who have taken a
statistics course have a mean of $42,500 with a standard deviation
of $6,800. Find a 68% confidence interval for ?μ. (NOTE: Do not use
commas or dollar signs in your answers. Round each bound to three
decimal places.)

Starting salaries of 64 college graduates who have taken a
statistics course have a mean of $43,500 with a standard deviation
of $6,800. Find a 68% confidence interval for μ. (NOTE: Do not use
commas or dollar signs in your answers. Round each bound to three
decimal places.)
Lower-bound:
Upper-bound:

(1 point) Starting salaries of 135 college graduates who have
taken a statistics course have a mean of $42,583. The population
standard deviation is known to be $9,171. Using 99% confidence,
find both of the following:
A. The margin of error:
B. Confidence interval: ,

How to calculate margin of error for this question?
Starting salaries of 80 college graduates who have taken a
statistics course have a mean of $42,893. Suppose the distribution
of this population is approximately normal and has a standard
deviation of $10,748.
Use a 93% confidence level.
Can't get the answer right :(

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