Question

3. Which of the following confidence levels will yield the smallest confidence interval?

a. 90% b. 95% c. 97% d. 99%

Answer #1

Using the T-Table, find the following values:
a) For a 90% confidence interval with a sample size of 11, tc
=
b) For a 95% confidence interval with a sample size of 20,
tc=
c) For a 99% confidence interval with a sample size of 25,
tc=

Q10. If population mean is included in the 95% confidence
interval then
a. 99% confidence interval will always include the mean
b. 90% confidence interval will never include that mean
c. 99% confidence interval will never include that mean
d. 90% confidence interval will always include the mean

We would like to construct a confidence interval for the mean μ
of some population. Which of the following combinations of
confidence level and sample size will produce the narrowest
interval?
A)
99% confidence, n = 35
B)
95% confidence, n = 30
C)
95% confidence, n = 35
D)
90% confidence, n = 30
E)
90% confidence, n = 35

Which of the following statements about confidence intervals are
true?
I. A 95% confidence interval will contain the true μ 95% of the
time.
II. If P(|X̅ − μ| > 3) = 0.035. Then a value of μ that is 3
or less units away from X̅ will be included in the 99% confidence
interval.
III. The point estimate X̅ will be included in a 99% confidence
interval.

Determine the margin of error for a confidence interval to
estimate the population proportion for the following confidence
levels with a sample proportion equal to 0.35 and n= 120
the margin of error for a confidence interval to estimate the
population portion for 90% confidence level is
the margin of error for a confidence interval to estimate the
population portion for 95% confidence level is
the margin of error for a confidence interval to estimate the
population portion for 97%...

Which of the following is true when a 95% confidence interval for a
population proportion is changed to a 99% confidence interval, with
all other parts of the interval remaining constant? Clear
Detailed Work Please! Thank you for your hard work!
One of these 4 options is correct:
A. interval size increases by 4%
B. interval size decreases by 4%
C. interval size increases by 31%
D. interval size decreases by 31%

Construct 90%, 95%, and 99% confidence intervals to estimate μ
from the following data. State the point estimate. Assume the data
come from a normally distributed population. 13.3 11.6 11.9 12.2
12.5 11.4 12.0 11.7 11.8 13.3
(Round the intermediate values to 4 decimal places. Round your
answers to 2 decimal places.)
90% confidence interval: enter the lower limit of the 90%
confidence interval ≤ μ ≤ enter the upper limit
of the 90% confidence interval
95% confidence interval: enter the...

The width of a confidence interval will be:
Narrower for 98 percent confidence than for 90 percent
confidence.
Wider for a sample size of 64 than for a sample size of 36.
Wider for a 99 percent confidence than for 95 percent
confidence.
Narrower for a sample size of 25 than for a sample size of
36.
None of these.

A researcher computed 90%, 95%, 98% and 99% confidence intervals
for a population mean. However, he forgot to record which interval
was which, and he cannot find the sample data to allow him to
recreate the intervals from scratch. He now needs only the 99%
confidence interval. Which one is it?
a-(37.9, 42.1)
b-(38.4, 41.6)
c-(38.1, 41.9)
d-(38.7, 41.3)

Determine the margin of error for a confidence interval to
estimate the population mean with n = 15 and s =15.8 for the
confidence levels below A. 80% B. 90% C. 99%

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