Question

Use the given confidence level and sample data to find a confidence interval for the population standard deviation. Assume that the population has a normal distribution. College students' annual earnings: 98% confidence; n = 9, sample mean = $3211, s = $897 Please show work using Excel

Answer #1

Solution:

Use the given confidence level and sample data to find a
confidence interval for the population standard deviation . Assume
that a simple random sample has been selected from a population
that has a normal distribution. Salaries of college who took a
course in college
98% confidence n=81 x^-=
$65,700 s=$17,931
the table of Chi-Square critical values.
$ < standard deviation < $

Use the given confidence level and sample data to find a
confidence interval for the population standard deviation sigma .
Assume that a simple random sample has been selected from a
population that has a normal distribution.
Salaries of college professors who took a philosophy course in
college
95 % confidence; n = 91, x overbar = $65,200, s =
$16,815

Use the given confidence level and sample data to find a
confidence interval for the population standard deviation sigma.
Assume that a simple random sample has been selected from a
population that has a normal distribution. Salaries of college
graduates who took a statistics course in college 80% confidence;
nequals61, x overbarequals$56 comma 600, sequals$16 comma
432

Use technology and the given confidence level and sample data to
find the confidence interval for the population mean
muμ. Assume that the population does not exhibit a normal
distribution.
Weight loss on a diet: 95% confidence, n= 51, X bar= 3.0kg,
s=5.3kg
What is the confidence interval for the population mean
muμ?
Is the confidence interval affected by the fact that the
data appear to be from a population that is not normally
distributed?
A. Yes, because the population...

Use the given degree of confidence and sample data to construct
a confidence interval for the population standard deviation Assume
that the population has a normal distribution.
A laboratory tested seventy-one chicken eggs and found that the
mean amount of cholesterol was 215milligrams with s =12.1
milligrams. Construct a 90% confidence interval for the true
standard deviation of cholesterol content of all such eggs.
please show work or explain

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean μ. Assume that the
population has a normal distribution. Thirty randomly selected
students took the calculus final. If the sample mean was 90 and the
standard deviation s = 6.7, construct a 99% confidence interval for
the mean score of all students

Construct a 98% confidence interval for the population
mean. Assume the population has a normal distribution. A random
sample of 40 college students has mean annual earnings of $3200
with a standard deviation of $665.

Use the given degree of confidence and sample data to find a
confidence interval for the population standard deviation σ. Assume
that the population has a normal distribution. Round the confidence
interval limits to the same number of decimal places as the sample
standard deviation.
Weights of men: 90% confidence; n = 14, = 161.5 lb, s =
13.7 lb

Use given degree of confidence and sample data to construct a
confidence interval for the population mean. Assume that the
population has a normal distribution. N=30, sample mean =84.6,
s=10.5%, 90% confidence

Use the given data to find the 95% confidence interval estimate
of the population mean μ. Assume that the population has a normal
distribution. IQ scores of professional athletes: Sample size n=30
Mean x¯¯¯=103 Standard deviation s=12

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