Question

A simple random sample with n=50 provided a sample mean of 22.5 and a sample standard deviation of 4.2 .

**a.** Develop a 90% confidence interval for the
population mean (to 1 decimal).

( , )

**b.** Develop a 95% confidence interval for the
population mean (to 1 decimal).

( , )

**c.** Develop a 99% confidence interval for the
population mean (to 1 decimal).

( , )

**d.** What happens to the margin of error and the
confidence interval as the confidence level is increased?

They increase / They decrease / They stay the same / It cannot be determined from the given data / The margin of error increases and the confidence interval becomes narrower / The margin of error decreases and the confidence interval becomes wider

Answer #1

A simple random sample
with n=54 provided a sample mean of 24.0 and a sample standard
deviation of 4.3.
a.
Develop a confidence interval for the population mean (to 1
decimal).
,
b.
Develop a confidence interval for the population mean (to 1
decimal).
,
c.
Develop a confidence interval for the population mean (to 1
decimal).
,
d.
What happens to the margin of error and the confidence interval as
the confidence level is increased?
- Select your answer...

A simple random sample with
n = 52
provided a sample mean of 28.5 and a sample standard deviation
of 4.4. (Round your answers to one decimal place.)
(a)
Develop a 90% confidence interval for the population mean.
to
(b)
Develop a 95% confidence interval for the population mean.
to
(c)
Develop a 99% confidence interval for the population mean.
to
(d)
What happens to the margin of error and the confidence interval
as the confidence level is increased?
As...

A simple random sample with n=56 provided a sample mean of 23.5
and a sample standard deviation of 4.5.
a. Develop a 90% confidence interval for the
population mean (to 1 decimal).
(_____, ______)
b. Develop a 95% confidence interval for the
population mean (to 1 decimal).
(_____, ______)
c. Develop a 99% confidence interval for the
population mean (to 1 decimal).
(_____, ______)
d. What happens to the margin of error and the
confidence interval as the confidence level...

A simple random sample with N=52 provided a sample mean of 21.0
and a sample standard deviation of 4.4.
a. Develop a 90% confidence interval for the
population mean (to 1 decimal).
(________, _________)
b. Develop a 95% confidence interval for the
population mean (to 1 decimal).
(________, _________)
c. Develop a 99% confidence interval for the
population mean (to 1 decimal).
(________, _________)
d. What happens to the margin of error and the
confidence interval as the confidence level...

A simple random sample with
n = 57
provided a sample mean of 22.5 and a sample standard deviation
of 4.4. (Round your answers to one decimal place.)
(a)
Develop a 90% confidence interval for the population mean.
to
(b)
Develop a 95% confidence interval for the population mean.
to
(c)
Develop a 99% confidence interval for the population mean.
to

A simple random sample with n=50provided a sample mean of 23.5
and a sample standard deviation of 4.3
a. Develop a 90% confidence interval for the
population mean (to 1 decimal).
,
b. Develop a 95% confidence interval for the
population mean (to 1 decimal).
,
c. Develop a 99% confidence interval for the
population mean (to 1 decimal).
,
d. What happens to the margin of error and the
confidence interval as the confidence level is increased?

You may need to use the appropriate appendix table or technology
to answer this question.
A simple random sample with
n = 59
provided a sample mean of 26.5 and a sample standard deviation
of 4.4. (Round your answers to one decimal place.)
(a)
Develop a 90% confidence interval for the population mean.
to
(b)
Develop a 95% confidence interval for the population mean.
to
(c)
Develop a 99% confidence interval for the population mean.
to
(d)
What happens to...

The sample data below have been collected based on a simple
random sample from a normally distributed population.
Complete parts a and b.
3 7 0 0 0 1 9 3 9 1
a. Compute a 98% confidence interval estimate for the population
mean.
The 98% confidence interval for the population mean is
from_________ to ___________.
(Round to two decimal places as needed. Use ascending order.)
b. Show what the impact would be if the confidence level is
increased to...

Example Problem: [Ch 8, Q14] A simple random sample with n=54
provided a sample mean of 22.5 and a sample standard deviation of
4.4. Develop a 90% confidence interval for the population mean
using the relevant fact: i) for a tdistribution with 53 degrees of
freedom, ?(? > 1.674) = 0.05; ii) for a tdistribution with 54
degrees of freedom, ?(? > 1.297) = 0.10.

A simple random sample of size n is drawn. The sample? mean,x is
found to be 17.6 and the sample standard? deviation, s, is found to
be
4.1
(a) Construct a 95% confidence interval about ? if the sample
size, n, is 34
The confidence interval is?
(b) Construct a 95% confidence interval about ? if the sample
size, n, is 61
The confidence interval is (?,?)
(use ascending order. Round to two decimal places as needed)
How does increasing...

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