Question

What is the confidence interval estimate? Provide two examples.

Answer #1

Statisticians use a confidence interval to describe the amount of uncertainty associated with a sample estimate of a population parameter.

The confidence level describes the uncertainty associated with a sampling method. Suppose we used the same sampling method to select different samples and to compute a different interval estimate for each sample. Some interval estimates would include the true population parameter and some would not. A 90% confidence level means that we would expect 90% of the interval estimates to include the population parameter; a 95% confidence level means that 95% of the intervals would include the parameter; and so on.

what happens to the width of a confidence interval as the
confidence
level increases? Provide some examples and explain your
answers.

What is a point estimate? What is an
interval estimate? What is a confidence interval? ; What does it
mean to say that we have 95% confidence in an interval?

You provide your boss with a point estimate of 17 and a 95%
confidence interval of [13.1,
20.9] for the mean number of armor piercing rounds needed to
penetrate a new type of reactive
armor, based on data from 5 trials. Sigma is unknown for this
population, so you had to rely on s
in your calculation. She tells you that the range from 13.1 to
20.9 is too wide to be useful and
asks you to narrow it. Legitimate...

If we change a 95% confidence interval estimate to a 99%
confidence interval estimate, we can expect
A.
the required sample size to increase
B.
the UCL - LCL range to decrease
C.
precision of the estimate to decrease
D.
precision of the estimate to increase

Define confidence interval and degree of confidence. Provide at
least one example of a confidence interval and interpret the
result.

For a 99.9% confidence interval estimate of the difference in
two proportions, what value must you multiply the standard error by
to obtain the margin of error? (Record your answer accurate to the
nearest FOURTH decimal place with standard rounding.)

Provide three examples of an interval level of
measurement.

Determine the margin of error for a confidence interval to
estimate the population proportion for the following confidence
levels with a sample proportion equal to 0.35 and n= 120
the margin of error for a confidence interval to estimate the
population portion for 90% confidence level is
the margin of error for a confidence interval to estimate the
population portion for 95% confidence level is
the margin of error for a confidence interval to estimate the
population portion for 97%...

Consider the data to the right from two independent samples.
Construct 95% confidence interval to estimate the difference in
population means. Click here to view page 1 of the standard normal
table. LOADING... Click here to view page 2 of the standard normal
table.
x1= 44
x2=50
σ1=10
σ2=15
n1= 32
n2 = 39 The confidence interval is what two numbers, . (Round
to two decimal places as needed)

Assume we want to estimate with a confidence interval what
percent of Americans are planning on going on a vacation this year.
If we desire a 95% confidence interval with a margin of error no
larger than +/- 5%, how many people must we survey

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 9 minutes ago

asked 12 minutes ago

asked 23 minutes ago

asked 23 minutes ago

asked 24 minutes ago

asked 28 minutes ago

asked 30 minutes ago

asked 34 minutes ago

asked 34 minutes ago

asked 39 minutes ago

asked 39 minutes ago

asked 44 minutes ago