Question

A study was made to estimate the difference in salaries of college professors in the private and state college of Virginia. A random sample of 100 professors in private colleges showed an average 9 months salary of 25050.55 with a standard deviation of 1098.62. A random sample of 200 professors in state colleges showed an average salary of 26006.71 with a standard deviation of 1362.17. Construct a 90% confidence interval for the ratio of two variances.

Answer should be written on word doc

Answer #1

1. A statistician studies the average annual salary of
professors in a local college in Florida.
<a> Based on a random sample of 33 professors in this
college, we found the mean salary is 52,000, and standard deviation
is 6,400. Construct a 99% confidence interval for the population’s
mean annual salary.
<b> Based on another random sample of size 28, we found the
mean salary is 54,500, and if we know the standard deviation of all
professors in that college...

1. A statistician studies the average annual salary of
professors in a local college in Florida. Based on a random sample
of 33 professors in this college, we found the mean salary is
52,000, and standard deviation is 6,400. Construct a 99% confidence
interval for the population’s mean annual salary.
Based on another random sample of size 28, we found the
mean salary is 54,500, and if we know the standard deviation of all
professors in that college is 7,200....

In order to estimate the difference between the average yearly
salaries of top managers in private and governmental organizations,
the following information was gathered.
Private
Governmental
Sample Size
50
60
Sample Mean (in $1000s)
90
80
Sample Standard Deviation
(in $1000s)
6
8
Develop an interval estimate for the difference between the
average yearly salaries of top managers of the two sectors. Use 95%
confidence and give your answers in dollars.

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...

Two kinds of threads are been
compared for strength. Fifty pieces of each type of thread are
tested under similar conditions. Brand A has an average tensile
strength of 79.72 kg with a standard deviation of 5.14 KG while
Brand B has an average tensile strength of 86.89 with a standard
deviation of 5.63. Construct a 90% confidence interval for the
ratio of two variances.
answer should be written on word
doc.

A study was conducted to estimate the effect of college student
employment on academic performance. In a random sample of 15
working students, the mean GPA was 2.4 with a standard deviation of
0.05. In a random sample of 13 nonworking students, the mean GPA
was 2.3 with a standard deviation of 0.03. Assume the populations
are normal with equal variances. Round your critical value to three
decimals.
Enter your answers rounded to four decimal places.
(a). The pooled sample...

The average annual cost (including tuition, room, board, books,
and fees) to attend a public college takes nearly a third of the
annual income of a typical family with college-age children.† At
private colleges, the average annual cost is equal to about 60% of
the typical family's income. The following random samples show the
annual cost of attending private and public colleges. Data are in
thousands of dollars.
Private Colleges 52.8, 42.2, 44.0, 34.3, 44.0, 29.6, 46.8, 36.8,
51.5, 41.0...

The average cost of tuition plus room and board for a small
private liberal arts college is reported to be $8,500 per term, but
a financial administrator believes that the average cost is higher.
A study conducted using 350 small liberal arts colleges showed that
the average cost per term is $8,745. The population standard
deviation is $1,200. Let α = 0.01. What is the critical z-value for
this test?
Please show work

The average cost of tuition and room and board at a small
private liberal arts college is reported to be $8,500 per term. A
financial administrator believes that the average cost is higher. A
study conducted using 350 small liberal arts colleges showed that
the average cost per term is $8,745. The population standard
deviation is $1,200. Let α = 0.05. What is the p-value for this
test?
A. 0.0000
B. 0.0124
C. 0.4938
D. 0.0500

The annual salaries of College Presidents in 1993 had a
population mean of $150,000 and standard deviation of $20,000. A
random sample of 64 College Presidents is chosen from this
population. 11. What is the probability that the sample average
salary of this randomly chosen sample is less than $144,300? a.
0.0113 b. 0.0222 c. 0.0375 d. 0.4778 e. 0.6293

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 5 minutes ago

asked 5 minutes ago

asked 11 minutes ago

asked 16 minutes ago

asked 16 minutes ago

asked 18 minutes ago

asked 24 minutes ago

asked 41 minutes ago

asked 41 minutes ago

asked 42 minutes ago

asked 49 minutes ago