Question

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 :

Answer #1

**Solution:**

**GIVEN
THAT:**

A 99% confidence interval estimate for a population mean is determined to be 85.58 to 96.62.

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%...

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

Construct a? 99% confidence interval to estimate the population
mean using the data below. x?=25 , s=4.5 , n=22 , N=180. The 99%
confidence interval for the population mean is? (Round to two
decimal places)

Construct a 99% confidence interval to estimate the population
mean using the data below.
x over bar equals 25
s equals 3.5
n equals 23
N equals 180
The 99% confidence interval for the population mean is
(____,____)

Determine the margin of error for a 99% confidence interval to
estimate the population mean when s = 40 for the sample sizes
below. a) nequals12 b) nequals25 c) nequals50
a) The margin of error for a 99% confidence interval when
nequals12 is _____. (Round to two decimal places as needed.)
b) The margin of error for a 99% confidence interval when
nequals25 is ____. (Round to two decimal places as needed.)
c) The margin of error for...

A manager wishes to estimate a population mean using a 99%
confidence interval estimate that has a margin of error of plus or
minus±48.0 If the population standard deviation is thought to be
630, what is the required sample size?
The sample size must be at least?

Determine the margin of error for a confidence interval to
estimate the population mean with nequals25 and s = 12.7 for the
confidence levels below. a) 80% b) 90% c) 99% a) The margin
of error for an 80% confidence interval is _.

Construct a 99% confidence interval to estimate the population
mean using the data below.
x overbarx=15
s=5.6
n=12
What assumptions need to be made about this population?
The 99% confidence interval for the population mean is from a
lower limit of ____ to an upper limit of ____

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)...

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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