Question

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

Answer #1

Increasing the confidence-interval level from .95 to .99
a.
increases the likelihood of including the population mean within
its limits
b.
decreases the likelihood of including the population mean within
its limits
c.
increases the number of degrees of freedom
d.
none of these, since a confidence interval may never include the
true population mean

A 99% confidence interval estimate of the population mean ? can
be interpreted to mean:
a) if all possible sample are taken and confidence intervals
created, 99% of them would include the true population mean
somewhere within their interval.
b) we have 99% confidence that we have selected a sample whose
interval does include the population mean.
c) we estimate that the population mean falls between the lower
and upper confidence limits, and this type of estimator is correct
99%...

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...

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 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)

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 :

Construct a 95% confidence interval for the population
mean,Assume the population has a normal distribution, A random
sample of 16 fluorescent light bulbs has a mean life of 645 hours
with a standard devastion of 31 hours.
From the above question calculate the 99% confidence interval
for n = 16.
then, Letting n= 100, calculate the 95% and 99% confidence
intervals
(a) What happend to the interval width from 95% to 99%
(b) what happend to the interval width from...

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)...

1. Develop 90 %, 95 %, and 99% confidence intervals for
population mean (µ) when sample mean is 10 with the sample size of
100. Population standard deviation is known to be 5.
2. Suppose that sample size changes to 144 and 225. Develop
three confidence intervals again. What happens to the margin of
error when sample size increases?
3. A simple random sample of 400 individuals provides 100 yes
responses. Compute the 90%, 95%, and 99% confidence interval for...

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

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