Question

A 95% confidence interval for a population mean is determined to be 100 to 120. A. Multiple Choice. What is the sample mean? a) 100 b)110 c)120 d)Not enough information to determine B. What is the margin of error? a)5 b)10 c)20 d) 100 e) Not enough information to determine C. IF the conflidence level is reduced to 90%, which of the following is a viable option for the limits of the interval? a) (85,135) b) (85,130) c) (105,115) d) (105,125) e) none of the above

Answer #1

Proof for part A)

Based on a sample of size 49, a 95% confidence interval for the
mean score of all
students, μ, on an aptitude test is from 59.2 to 64.8.
Find the margin of error.
Group of answer choices
A) 2.8
B) 0.05
C) 0.78
D) There is not enough information to find the margin of
error.
E) 5.6

Determine the margin of error for
a
95%
confidence interval to estimate the population mean when s
=
37
for the sample sizes below.
a)
nequals=15
b)
nequals=34
c)
nequals=46
a) The margin of error for
a
95%
confidence interval when
nequals=15
is
nothing.
(Round to two decimal places as needed.)
b) The margin of error for
a
95%
confidence interval when
nequals=34
is
nothing.
(Round to two decimal places as needed.)
c) The margin of error for
a
95%...

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(i) Find the margin of error for a 95% confidence interval for
estimating the population mean when the sample standard deviation
equals 90 with a sample size of 484
(ii).
(ii) Find the margin of error for a 95% confidence interval
for estimating the population mean when the...

A 95% confidence interval for the mean of a population is
computed to be 6 to 14. Which one of the following claims would the
interval tend to support?
A. The population mean is more than 7
B. The population mean is less than 15.
C. The population mean is exactly 9.
D. The population mean is between 8 and 10.
E. The population mean is more than 17.
(b) A 90% confidence interval for the mean of a population...

Q10. If population mean is included in the 95% confidence
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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

A
95%
confidence interval of
16.6
months to
49.6
months has been found for the mean duration of
imprisonment,
muμ,
of political prisoners of a certain country with chronic
PTSD.
a. Determine the margin of error, E.
b. Explain the meaning of E in this context in terms of the
accuracy of the estimate.
c. Find the sample size required to have a margin of error
of
12
months and a
99%
confidence level. (Use
sigmaσequals=42
months.)d. Find a
99%...

If you construct a 90% confidence interval for the population
mean instead of a 95% confidence interval and the sample size is
smaller for the 90%, but with everything else being the same, the
confidence interval would: a. remain the same b. become narrower c.
become wider d. cannot tell without further information.

A 99% confidence interval estimate for a population
mean is determined to be 85.58 to 96.62. If the
confidence level is reduced to 90%, the confidence interval
for :

A 95% confidence interval for a population mean is given as 32.2
< μ < 42.0. Round your answers to 1 decimal place.
(a) Calculate the sample mean. x =
(b) Calculate the margin of error. E =

A 95 % confidence interval of 16.2 months to 50.2 months has
been found for the mean duration of imprisonment, mu , of political
prisoners of a certain country with chronic PTSD.
a. Determine the margin of error, E.
b. Explain the meaning of E in this context in terms of the
accuracy of the estimate.
c. Find the sample size required to have a margin of error of 11
months and a 99 % confidence level. (Use sigma equals...

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