Question

Salaries of 48 college graduates who took a statistics course in college have a mean, x of $ 60,700. Assuming a standard deviation, sigma, of $10,499, construct a 90% 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 thanmuless than$ nothing (Round to the nearest integer as needed.)

Answer #1

90% confidence interval for is

- Z * / sqrt(n) < < + Z * / sqrt(n)

60700 - 1.645 * 10499 / sqrt(48) < < 60700 + 1.645 * 10499 / sqrt(48)

58207 < < 63193

90% CI is **( 58207 , 63193)**

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.

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 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.)

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
estimating the population mean μ.
____< mu<____

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.

Using the simple random sample of weights of women from a data
set, we obtain these sample statistics: nequals40 and x
overbarequals153.03 lb. Research from other sources suggests that
the population of weights of women has a standard deviation given
by sigmaequals30.91 lb. a. Find the best point estimate of the mean
weight of all women. b. Find a 90% confidence interval estimate of
the mean weight of all women. Click here to view a t distribution
table. LOADING... Click...

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.)

In a study designed to test the effectiveness of magnets for
treating back? pain, 35 patients were given a treatment with
magnets and also a sham treatment without magnets. Pain was
measured using a scale from 0? (no pain) to 100? (extreme pain).
After given the magnet? treatments, the 35 patients had pain scores
with a mean of 6.0 and a standard deviation of 2.4. After being
given the sham? treatments, the 35 patients had pain scores with a
mean...

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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