Question

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. Assuming a standard deviation, sigma σ, of $ 11 comma 850 11,850, construct a 99 99% confidence interval for estimating the population mean mu μ.

Answer #1

Solution :

Given that,

Z_{/2}
= 2.576

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

= 2.576 * (11850 / 47)

= 4453

At 99% confidence interval estimate of the population mean is,

- E < < + E

63400 - 4453 < < 63400 + 4453

58947 < < 67853

(**58947** , **67853**)

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99% confidence interval for estimating the population mean μ.
$ less than< μless than<$

Salaries of 45 college graduates who took a statistics course in
college have a mean, x overbar , of $ 65 comma 900 . Assuming a
standard deviation, sigma , of $12 comma 992 , construct a 95 %
confidence interval for estimating the population mean u .

Salaries of 45 college graduates who took a statistics course in
college have a mean (x overbar) of $69,800. Assuming a standard
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for estimating the population mean μ. (Don't round until end of
problem)
$_____<μ<$_____
(Round to the nearest integer as needed.)

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 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...

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____< mu<____

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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.)

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$ -----<μ< $------ round to nearest integer as needed

Salaries of
4848
college graduates who took a statistics course in college have
a mean,
x overbarx,
of
$ 69 comma 000$69,000.
Assuming a standard deviation,
sigmaσ,
of
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construct a
9595%
confidence interval for estimating the population mean
muμ.
$nothingless than<muμless than<$nothing
(Round to the nearest integer as needed.)

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