Question

In a random sample of 21 ?people, the mean commute time to work was 31.5 minutes and the standard deviation was 7.2 minutes. Assume the population is normally distributed and use a? t-distribution to construct a 80?% confidence interval for the population mean ?. What is the margin of error of ???

Interpret the results.

Answer #1

Sample size = 21

Degree of freedom = n-1 = 21 - 1 = 20

Sample standard deviation =7.2 minutes.

t critical value is 1.325

t critical value by using TINV(0.20,20)

the margin of error of ?

=2.0818

We can estimate population mean to within 2.0818 minutes with 80% confidence.

Confidence interval formula is

=>(29.42,33.58)........................a 80?% confidence interval for the population mean ?

We are 80% confident that population mean is between 29.42 minutes to 33.58 minutes.

In a random sample of 29 people, the mean commute time to work
was 30.1 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 80% confidence interval for the population mean μ?
What is the margin of error of μ? Interpret the results.

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 18 people, the mean commute time to work
was 32.4 minutes and the standard deviation was 7.2 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 99% confidence interval for the population mean mu.
What is the margin of error of mu? Interpret the results.

in a random sample of 17 people, the mean commute time to work
was 31.2 minutes and the standard deviation was 7.1 minutes.Assume
the population is normally distributed and use a t-distribution to
construct a 80% confidence interval for the population mean. what
is the margin of error of the mean? interpret the results. the
confidence interval for the population mean is ?

In a random sample of 22 people, the mean commute time to work
was 32.1 minutes and the standard deviation was 7.3 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 99% confidence interval for the population mean μ.
What is the margin of error of μ? Interpret the results.

In a random sample of 28 people, the mean commute time to work
was 33.6 minutes and the standard deviation was 7.1 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 99% confidence interval for the population mean μ.
What is the margin of error of μ? Interpret the results.

in a random sample of 24 people, the mean commute time to work
was 33.7 minutes and the standard deviation was 7.1 minuets .
assume the population is normally distributed and use a
t-distribution to construct a 99% confidence interval for the
population mean. what is the margin of error of the mean? interpret
the results.

In a random sample of 28 people, the mean commute time to work
was 33.5 minutes and the standard deviation was 7.3 minutes. Assume
the population is normally distributed and use a t-distribution to
construct a 90% confidence interval for the population mean
muμ.
What is the margin of error ofmuμ?

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 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...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 16 minutes ago

asked 17 minutes ago

asked 19 minutes ago

asked 19 minutes ago

asked 23 minutes ago

asked 24 minutes ago

asked 26 minutes ago

asked 32 minutes ago

asked 33 minutes ago

asked 34 minutes ago

asked 38 minutes ago

asked 42 minutes ago