Question

a.) Given a normal distribution with σ = 0.380. Find the required sample size for a 95% confidence level (estimating the mean), given a margin-of-error of 6%.

b.) Given the sample results taken from a normal population
distribution: mean = 4.65, *σ* = 0.32, and n = 17.

For a 99% confidence interval, find the margin-of-error for the
population mean. (use 2 decimal places)

c.) Given the sample results taken from a normal population
distribution: mean = 1.25, *σ* = 1.95, and n = 9.

Find the *upper limit* of the 90% confidence interval for
the population mean. (use 2 decimal places)

Answer #1

Given the sample results taken from a normal population
distribution: mean = 4.65, σ = 0.32, and n = 13. Find the
margin-of-error and the 95% confidence interval for the population
mean. (use 2 decimal places)

Given the sample results taken from a normal population
distribution: mean = 4.65, σ = 0.32, and n = 19.
For a 90% confidence interval, find the margin-of-error for the
population mean. (use 2 decimal places)

A sample size of 26 is taken from a normal
distribution and a confidence interval is constructed. The sample
mean is 61 and the population standard deviation
is σ = 18.
Using a 99% confidence level,
find the margin of error,
E.

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 95% confidence interval for μ using the sample results x̄ = 79.7,
s = 6.6, and n=42
Round your answer for the point estimate to one decimal place, and
your answers...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 95% confidence interval for μ using the sample results x̄ = 79.7,
s = 6.6, and n = 42
Round your answer for the point estimate to one decimal place, and...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 95% confidence interval for μ using the sample results
x̅=10.4, s=5.3, and n=30.
Round your answer for the point estimate to one decimal place,
and your answers for the margin of...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 90% confidence interval for μ using the sample results x¯=144.2,
s=55.7, and n=50
Round your answer for the point estimate to one decimal place, and
your answers for the margin of...

Use the t-distribution to find a confidence interval for a mean
μ given the relevant sample results. Give the best point estimate
for μ, the margin of error, and the confidence interval. Assume the
results come from a random sample from a population that is
approximately normally distributed.
A 90% confidence interval for μ using the sample results x¯=142.0,
s=52.8, and n=50
Round your answer for the point estimate to one decimal place, and
your answers for the margin of...

Use the t-distribution to find a confidence interval
for a mean μ given the relevant sample results. Give the best point
estimate for μ, the margin of error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 95% confidence interval for μ using the sample results x¯=94.5,
s=8.5, and n=42
Round your answer for the point estimate to one decimal place, and
your answers for the margin of...

Use the t-distribution to find a confidence interval
for a mean given the relevant sample results. Give the best
point estimate for , the margin of
error, and the confidence interval.
Assume the results come from a random sample from a population that
is approximately normally distributed.
A 99% confidence interval for using the sample results x-bar =
93.8, s = 30.4, and n=15
Round your answer for the point estimate to one decimal place, and
your answers for the...

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