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**)

Salaries of 45 college graduates who took a statistics course in
college have a mean, overbar x, of comma $65,500. Assuming a
standard deviation, sigmaσ, of $14 comma 14,971, construct a
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 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
deviation,σ,of $12,063,construct a 95% confidence interval for
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____< mu<____

Salaries of 4747 college graduates who took a statistics course
in college have a mean, x overbarx, of $63,000. Assuming a
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μ.
(Round to the nearest integer as needed.)

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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 thanmuless than$ nothing (Round to the...

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: ,

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