Question

In a study of starting salaries for nurses, I surveyed 20 nurses. In this sample, the starting salary was $70,000 with a standard deviation of $8,000.

(a) (5pts) Develop a 95% confidence interval for the population mean.

(b) (5pts) Develop a 95% confidence interval for the population standard deviation.

Answer #1

6) In a study of starting salaries for nurses, I surveyed 20
nurses. In this sample, the starting salary was $70,000 with a
standard deviation of $8,000.
(a) (10pts) Develop a 95% confidence interval for the population
mean.
(b) (10pts) Develop a 95% confidence interval for the population
standard deviation.
Please write out. Thank you man!

1- Recently, a university surveyed recent graduates of the
English Department for their starting salaries. Four hundred
graduates returned the survey. The average salary was $25,000 with
a standard deviation of $2,500.
a) What is the best point estimate of the population mean?
b) What is the 95% confidence interval for the mean salary of
all graduates from the English Department?
Please show calculations on paper. Thank you.
c) What do the confidence interval results mean?

A sample of 75 New York public school teachers was surveyed
about their salaries. Their mean salary was $65467 with a standard
deviation of $5130.
a. Use the Confidence Interval Calculator and a 90% confidence
level to estimate the population mean salary.
$65467 +/- $
b. Use a 95% confidence level to estimate the population mean
salary.
$65467 +/- $
c. Use a 99% confidence level to estimate the population mean
salary.
$65467 +/- $

A university surveyed recent graduates of the English department
about their starting salaries. Four hundred graduates returned the
survey. The average salary was $25,000. Assume for purposes of this
problem that the population standard deviation is known, and it is
$2,500. A 95% confidence interval is constructed. What does the
confidence interval mean?
Group of answer choices
There is a 95% probability that the population parameter will
not lie within the interval constructed using the sample's
data.
The population mean...

A random sample of 20 starting salaries in a certain field found
an average of $23 per hour, and a standard deviation of $3.
Construct a 95% confidence interval for the true starting salary in
this field.

The mean starting salary for nurses is $67,694 nationally. The
standard deviation is approximately $11,333. The starting salary is
normally distributed. A sample 35 starting salaries for nurses is
taken. Find the probability that the sample mean is more than
$68,000. Represent the probability with a graph.

You have been asked to build a confidence interval of the
population mean starting salary for registered nurses in the United
Stats. You already know that the population standard deviation for
starting salaries is $7000 per year, and you want a margin of error
no greater than plus or minus $1000. What is the minimum sample
size that you should gather. If you want to have a level confidence
of 95$%?

A study was conducted to estimate the difference in the
mean salaries of elementary school teachers from two neighboring
states. A sample of 10 teachers from the Indiana had a mean salary
of $28,900 with a standard deviation of $2300. A sample of 14
teachers from Michigan had a mean salary of $30,300 with a standard
deviation of $2100. Determine a 95% confidence interval for the
difference between the mean salary in Indiana and Michigan.(Assume
population variances are different.) write...

Annual starting salaries for college graduates with degrees
in
business administration are generally expected to be between
$30,000 and
$45,000. Assume that a 95% confidence interval estimate of the
population mean annual starting salary is desired.
a. What is the planning value for the population standard
deviation?
How large a sample should be taken if the desired margin of error
is
b.$500?
c.$200?
d.$100?
e.Would you recommend trying to obtain the $100 margin of error?
Explain.

An experiment is conducted to compare the starting salaries of
male and female college graduates who find jobs. Pairs are formed
by choosing a male and a female with the same major and similar
grade point averages. Suppose a random sample of 10 pairs is formed
in this manner and the starting annual salary of each person is
recorded. The differences within the pairs are obtained by
subtracting the female salary from the male salary. The following
results are obtained:...

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