Question

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?

Answer #1

The following questions ask you to compute a point estimate and
confidence interval for a difference in proportions, p1 - p2. We
let n1 denote the number of trials and x1 the number of observed
successes in the first sample; and n2 denote the number of trials
and x2 the number of observed successes in the second sample.
a. n1 = 10, x1 = 7, n2 = 50, x2 = 5. Compute a point estimate
and 95% confidence interval for...

Determine the point estimate of the population mean and margin
of error for the confidence interval. Lower bound is 20?, upper
bound is 30. The point estimate of the population mean is _____.
The margin of error for the confidence interval is _____.

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

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%...

Select all the ways that one could correctly write a confidence
interval.
( ) point estimate ± margin of error
( ) point estimate ± SE
( ) [0.035, 0.145]
( ) pˆ±1.96*SE
From what I've found is that:
Confidence intervals are also often reported as: point
estimate ± margin of error
The confidence intervals we have encountered thus far have taken
the form: point estimate ± z* ×SE (z*= zscore)
Evaluate the CI and write in the form (___,___). ( CI=Confidence
Intervals)...

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...

Using SPSS, give a point estimate and a 95% confidence interval
estimate for the percentage of students who are female. Catagorical
variable where 1=female, 0=male. How would you do this in spss?

Suppose you construct a confidence interval for the population
mean. Then, your point estimate – the sample mean – will ALWAYS
fall inside the confidence interval no matter what level of
confidence you use.
Group of answer choices
True
False

What is the difference between a Point Estimate and a Confidence
Interval? Provide an example for both

A sample is to be taken to develop an approximate 95% confidence
interval estimate of the population mean. The population consists
of 550 elements, and a pilot study resulted in
s = 80.
What is the minimum sample size needed if we want to develop an
approximate 95% confidence interval with a width of 26? (Round your
answer up to the nearest whole number.)
n =

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