Question

In a random sample of 88 people, the mean commute time to work was 35.5 minutes and the standard deviation was 7.4 minutes. A 98% confidence interval using the t-distribution was calculated to be left (27.7,43.3). After researching commute times to work, it was found that the population standard deviation is 8.7 minutes. Find the margin of error and construct a 98% confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results.

Margin of Error U = ________

Answer #1

In a random sample of 8 people, the mean commute time to work
was 35.5 minutes and the standard deviation was 7.4 minutes. A 98%
confidence interval using the t-distribution was calculated to be
left (27.7,43.3).
After researching commute times to work, it was found that the
population standard deviation is 8.7 minutes. Find the margin of
error and construct a 98%
confidence interval using the standard normal distribution with
the appropriate calculations for a standard deviation that is
known....

In a random sample of 8 people, the mean commute time to work
was 35.5 minutes and the standard deviation was 7.3 minutes. A 98%
confidence interval using the t-distribution was calculated to be
(27.8,43.2). After researching commute times to work, it was found
that the population standard deviation is 8.9 minutes. Find the
margin of error and construct 98% confidence interval using the
standard normal distribution with the appropriate calculations for
a standard deviation that is known. Compare the...

In a random sample of 8 people, the mean commute time to work
was 35.5 minutes and the standard deviation was 7.2 minutes. A 95%
confidence interval using the t-distribution was calculated to be
left parenthesis 29.5 comma 41.5 right parenthesis. After
researching commute times to work, it was found that the
population standard deviation is 9.2 minutes. Find the margin of
error and construct a 95% confidence interval using the standard
normal distribution with the appropriate calculations for a...

In a random sample of
88
people, the mean commute time to work was
36.536.5
minutes and the standard deviation was
7.27.2
minutes. A
9898%
confidence interval using the t-distribution was calculated to
be
left parenthesis 28.9 comma 44.1 right
parenthesis(28.9,44.1).
After researching commute times to work, it was found that the
population standard deviation is
8.78.7
minutes. Find the margin of error and construct a
9898%
confidence interval using the standard normal distribution with
the appropriate calculations for a...

In a random sample of 8 people, the mean commute time to work
was 33.5 minutes and the standard deviation was 7.2 minutes. A 90%
confidence interval using the t-distribution was calculated to be
left parenthesis 28.7 comma 38.3 right parenthesis. After
researching commute times to work, it was found that the
population standard deviation is 9.3 minutes. Find the margin of
error and construct a 90% confidence interval using the standard
normal distribution with the appropriate calculations for a...

in
a random sample of 8 people the mean commute time to work was 34.5
minutes and the standard deviation was 7.2 minutes. A 90%
confidence interval using the t distribution was calculated to be
(29.7, 39.3). After researching commute times to work, it was found
that the population standard deviation is 9.2 minutes. Find the
margin of error and construct a 90% confidence interval using the
standard normal distribution with the appropriate calculations for
a standard deviation that is...

In a random sample of 20 people, the mean commute time to work
was 32.6 minutes and the standard deviation was 7.3 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 80% confidence interval for the population mean mu.
What is the margin of error of u? Interpret the results.
The confidence interval for the population mean u is?
What is the margin of error?

In a random sample of 21 people, the mean commute time to work
was 31.3 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 98% confidence interval for the population mean mu.
What is the margin of error of mu? Interpret the results. The
confidence interval for the population mean mu is left parenthesis
nothing comma nothing right parenthesis . (Round to one decimal
place as needed.) The...

In a random sample of 18 people, the mean commute time to work
was 33.1 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 98% confidence interval for the population mean mu .
What is the margin of error of mu? Interpret the results.
The confidence interval for the population mean mu is:
The margin of error of mu is:

In a random sample of eight people the mean commute time to work
was 35.5 minutes, and the SD was 7.2, find the t distribution to
find the mean margin or error, given 95% confidence intervals for
the population mean.

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