Question

A random sample of 16 men have a mean height of 67.5 inches and a standard deviation of 3.4 3.4 inches. Construct a 99% confidence interval for the population standard deviation, sigma σ.

Answer #1

A random sample of 20 women have a mean height of 62.5 inches
and a standard deviation of 1.3 inches. Construct a 98% confidence
interval for the population variance, sigma(2)

A simple random sample of 16 students from our class was taken.
The mean height was 66.9 inches with a standard deviation of 2.8
inches. You will be asked some questions about confidence intervals
for the actual mean height of all the students in this class.
Interpret the 99% confidence interval.

Suppose a random sample of 50 basketball players have an
average height of 78 inches. Also assume that the population
standard deviation is 1.5 inches.
a) Find a 99% confidence interval for the population
mean height.
b) Find a 95% confidence interval for the population
mean height.
c) Find a 90% confidence interval for the population
mean height.
d) Find an 80% confidence interval for the population
mean height.
e) What do you notice about the length of the confidence...

1) The mean height of women in a country (ages 20-29) is 64.3
inches. A random sample of 75 women in this age group is selected.
What is the probability that the mean height for the sample is
greater than 65 inches? assume σ = 2.59
The probability that the mean height for the sample is greater
than 65 inches is __.
2) Construct the confidence interval for the population mean
μ
C=0.95 Xbar = 4.2 σ=0.9 n=44
95% confidence...

A random sample of 144 trees in a New England forest has a mean
height of 10.452 meters and a standard deviation of 2.130 meters.
Construct a 99% confidence interval for the population mean
height.

The prices of a random sample of 24 new motorcycles have a
sample standard deviation of $3738.
Assume the sample is from a normally distributed population.
Construct a confidence interval for the population variance
sigma squaredσ2 and the population standard deviation sigmaσ.
Use a 99% level of confidence. Interpret the results.

Assume that the heights of female executives are normally
distributed. A random sample of 20 female executives have a mean
height of 62.5 inches and a standard deviation of
1.71.7
inches. Construct a 98% confidence interval for the population
variance,
sigma squaredσ2.
Round to the nearest thousandth.

Assume that the heights of female executives are normally
distributed. A random sample of 20 female executives have a mean
height of 62.5 inches and a standard deviation of 1.7 inches.
Construct a 98% confidence interval for the population variance,
sigma squared. Round to the nearest thousandth.

Construct a 95% confidence interval for the population standard
deviation σ of a random sample of 15 men who have a mean weight of
165.2 pounds with a standard deviation of 12.6 pounds. Assume the
population is normally distributed.

The heights (in inches) of the students on a campus have a
normal distribution with a population standard deviation σ =5
inches. Suppose we want to construct a 95% confidence interval for
the population mean height and have it accurate to within 0.5
inches. What is the required minimum sample size?

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