Question

Which of the following terms are included in a 95% confidence interval for a mean found from a sample of 25? a. the mean b. T value for a df of 24, at two tail .05 C. the standard error of the mean D. all of these are used E. only a and b

Answer #1

Which of the following terms are included in a 95% confidence
interval for the difference between two means found from a sample
of 25 for each sample?
a. the mean
b. T value for the df of 49, at two tail .05
c.all of these are used
d. only a and c

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%...

Question 1.
Which of the following is the CORRECT interpretation of a 95%
confidence interval?
a) There is a 95% probability that the interval contains the
population value
b) There is a 95% chance that the true population value is
inside the interval
c) if we sampled from a population repeatedly and created
confidence intervals, 95% of those confidence intervals would
contain the population mean
d) We are 95% sure of the sample statistic
Question 2.
What is the mean...

11. The correct interpretation of 95% confidence is (Circle
one):
a) We can be 95% confident that the interval includes the sample
mean.
b) 95% of all possible population means will be included in the
interval.
c) 95% of the possible sample means will be included in this
interval.
d) The method used to get the interval, when used over and over,
produces intervals which include the true population mean 95% of
the time.
12. Suppose a two-sided (or two-tailed)...

A confidence interval, at the 95% confidence level will be used
to answer what the mean annual salary of a Ford car owner is. Data
was collected from 34 Ford car owners across the country. the mean
annual salary of the 34 Ford owners was 225000. The standard
deviation of all Ford owners is known to be $970.
a. The value at the center of the confidence interval represents
what? (sample mean, standard dev., population mean, or sample
size)
b....

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

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...

If (14.5, 33.708) is a 95% confidence interval for a population
mean, which of the following would be a 98% confidence interval
calculated from the same set of sample data that was used to create
the 95% confidence interval above? Round your answer to three
decimal places.
a-(12.707, 35.501)
b-(12.809, 39.191)
c-(11.482, 36.726)
d-(14.617, 31.683)

We use the t distribution to construct a confidence
interval for the population mean when the underlying population
standard deviation is not known. Under the assumption that the
population is normally distributed, find
tα/2,df for the following
scenarios. (You may find it useful to
reference the t table. Round your
answers to 3 decimal places.)
tα/2,df
a.
A 90% confidence level and a sample of 11 observations.
b.
A 95% confidence level and a sample of 11 observations.
c.
A...

Using a T-Interval on your calculator to find a 95% confidence
interval estimate of a mean when the sample mean from a sample of
35 individuals is 132.5 and the sample standard deviation is 14.7,
what is the resulting margin of error?

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