Question

2. Does the margin of error increase or decrease if all remains
the same except that

a. the standard deviation of the sample is increased?

b. the sample size is increased?

c. the confidence level is increased?

Answer #1

What will a decrease in the sample standard deviation do to the
margin of error of a confidence interval on , assuming that all
other quantities in the confidence interval formula stay the
same?
A.
it decreases
B.
nothing
C.
it increases
D.
impossible to tell without a confidence level, C.

3. Examine the following equation for the margin of error when
estimating the Population Mean.
( does it increase or decrease?)
Indicate the effects of Margin of error resulting from:
a. Standard error
b. Sample size
c. Confidence level
d. Standard deviation

A confidence interval can be useless if it is too wide (i.e.,
the margin of error is too big). Suppose that the population
standard deviation is known. Which one of the following
recommendations will NOT reduce the width (i.e., the margin of
error) of the confidence interval?
a. increase the confidence level for the interval estimation,
without changing the sample size.
b. lower the confidence level for the interval estimation,
without changing the sample size
c. lower the confidence coefficient...

Margin of error (m.o.e.) is the same thing as the maximum error
of the estimate (m.e.e.). There are two names for the same thing.
(a)The z value for a 96.6% confidence interval estimate is A. 2.12
B. 1.82 C. 1.96 D. 2.00 (b) In developing a confidence interval for
a population mean, a sample of 50 observations was used. The
interval was determined to be 19.55 to 22.31. The margin of error
(m.o.e.) for this interval is... A. 1.05 B....

2. An NHANES report
gives data for 654 women aged 20 to 29 years. The mean BMI for
these 654 women was x = 26.8. On the basis of this sample, we are
going to estimate the mean BMI μ in the
population of all 20.6 million women in this age group. We will
assume that the NHANES sample is a SRS from a normal distribution
with known standard deviation σ = 7.5
a) Construct 3 confidence intervals for the...

2.
Based on a sample data of 64 children mean age of children in the
summer camp A is 12,4 years with Standard deviation 3 years.
Estimate the average age of children in whole population.
Population size is 8100
a) Find the point estimation for average age
b) With 95% confidence, what is the margin of error? With 90%
confidence, what is the margin of error?
c) What is the 95% confidence interval estimate of the population
mean (mean children...

Suppose that in planning a study you calculate the margin of
error and decide that it is too large. Specifically, you would like
it to be one-half as large. A reasonable strategy for achieving the
smaller margin of error would be to:
decrease the population standard deviation by one-half.
double the sample size.
include four times as many observations in your sample.
make the confidence level one-half as large.
detailed explanation please!!!Thanks!!!

The margin of error for a confidence interval depends on the
confidence level, the standard deviation, and the sample size. Fix
the confidence level at 95% and the sample standard deviation at 1
to examine the effect of the sample size. Find the margin of error
for sample sizes of 5 to 100 by 5's -- that is, let n = 5, 10, 15,
..., 100. (Round your answers to three decimal places.)
5
10
15
20
25
30
35...

Explain whether the width of a 95% confidence interval would
increase, decrease, or remain the same as a result of each of the
following changes.
(a) Decrease the confidence level from 95% to 90%.
(b) Decrease the sample size from n = 1000 to n = 500.

Find the margin of error for a 95% confidence interval for
estimating the population mean when the sample standard deviation
equals 90 with a sample size of (i) 484 and (ii) 1600
(i) Find the margin of error for a 95% confidence interval for
estimating the population mean when the sample standard deviation
equals 90 with a sample size of 484
(ii).
(ii) Find the margin of error for a 95% confidence interval
for estimating the population mean when the...

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