Question

Note: Each bound should be rounded to three decimal places.

A random sample of ?=100 observations produced a mean of ?=26 with a standard deviation of ?=5

(a) Find a 99% confidence interval for ?

Lower-bound:___ Upper-bound:___

(b) Find a 90% confidence interval for ?

Lower-bound:___ Upper-bound:___

(c) Find a 95% confidence interval for ?

Lower-bound: ___ Upper-bound:____

Answer #1

Note: Each bound should be rounded to three decimal
places.
Q: A random sample of n=100 observations
produced a mean of x bar=35 with a standard
deviation of s=5.
(a) Find a 95% confidence interval for μ
Lower-bound: Upper-bound:
(b) Find a 90% confidence interval for μ
Lower-bound: Upper-bound:
(c) Find a 99% confidence interval for μ
Lower-bound: Upper-bound:

(1 pt) A random sample of 100 observations produced a mean of
x-bar = 23.1 from a population with a normal distribution and a
standard deviation = 2.42. (a) Find a 90% confidence interval (b)
Find a 99% confidence interval (c) Find a 95% confidence
interval

A statistics practitioner took a random sample of 80
observations from a population with a standard deviation of 25 and
compute the sample mean to be 100.
(a) Estimate the population mean confidence interval with 90%
confidence level, 95% confidence level and 99% confidence
level.
(b) Describe the effect of increasing the confidence level on
the confidence interval.
(c) At 99% confidence level, if the population standard
deviation is reduced to 16, will the confidence interval be wider
or narrower?

Show steps please
A random sample of 10 children found that the average growth for
the first year was 9.8 inches. The sample standard deviation was
0.96 inches. Find the 95% confidence interval for the true
mean.
The lower bound of the interval is ___________
The upper bound of the interval is ___________
Round to 4 decimal places.

An NHANES report gives data for 647 women aged 20–29 years. The
BMI of these 647 women was ?¯= 25.8 . On the basis of this sample,
we want to estimate the BMI ? in the population of all 20.6 million
women in this age group. We treated these data as an SRS from a
Normally distributed population with standard deviation ?=7.1 .
(a) Give three confidence intervals for the mean BMI ? in this
population, using 90%,95%,and 99% confidence....

A simple random sample of size n equals 40 is drawn from a
population. The sample mean is found to be x overbar equals 121.4
and the sample standard deviation is found to be s equals 12.4.
Construct a 99% confidence interval for the population mean.
The lower bound is ?. (Round to two decimal places as
needed.)
The upper bound is ?. (Round to two decimal places as
needed.)

A statistics practitioner took a random sample of 56
observations from a population whose standard deviation is 32 and
computed the sample mean to be 102.
Note: For each confidence interval, enter your answer in the
form (LCL, UCL). You must include the parentheses and the comma
between the confidence limits.
A. Estimate the population mean with 95% confidence.
Confidence Interval =
B. Estimate the population mean with 90% confidence.
Confidence Interval = C.
Estimate the population mean with 99%...

A simple random sample of size n equals n=40 is drawn from a
population. The sample mean is found to be x=120.4 and the sample
standard deviation is found to be s equals s=12.5. Construct a 99%
confidence interval for the population mean.
a) The lower bound is __
b) The upper bound is ___
(Round to two decimal places as needed.)

Find and interpret a 95 percent confidence interval up to 4
decimal places for a population with a mean U for n=36
A random sample of n=300 observations from a binomial population
produced x=263 successes. Find a 90 percent confidence interval for
p and interpret the interval to 4 decimal places

Answers to the following questions should be calculated in
Matlab and given to 4 decimal places. Be careful not to introduce
errors by rounding in any intermediate calculations as this may
lead to an incorrect final answer. A confidence interval is desired
for the true average load loss μ (watts) for a certain type of
induction motor when the line current is held at 10 amps for a
speed of 1500 rpm. A random sample of 52 motors were tested...

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