Question

- Two estimates are available for the same population parameter. Estimate one has a standard deviation of 9.3 and estimate two has a standard deviation of 9.4. Estimate two is unbiased, whereas estimate one is biased. Which estimate would you choose and why?

Answer #1

Suppose we go back to the example from question 3. Suppose the
probability remains at 16% but we now take a sample of size 100.
What is the standard error of the proportion?
What is the probability that the sample proportion of people
who have white as ethnicity is between 10% and 25%?
Two estimates are available for the same population parameter.
Estimate one has a standard deviation of 9.3 and estimate two has a
standard deviation of 9.4. Estimate...

Although s is a(n) ____ estimate of the population standard
deviation, it is more regularly reported than s2 because ___. A)
biased; it is easier to calculate because the standard deviation is
reported in units instead of squared units. B) biased; it is easier
than the standard deviation to read and is reported in units
instead of squared units. C) unbiased; the sample variance is
always a biased estimator of the population variance. D) unbiased;
the standard deviation is easier...

Why is the descriptive standard deviation of a sample a biased
estimate of population standard deviation? How do we correct for
this bias?

Give one example of a population parameter that you would like
to estimate and why?

What is sampling error?
A.The discrepancy between a sample estimate of a population
parameter and the real population parameter
B.The discrepancy between the sample mean and the sample
standard deviation
C.The discrepancy between the observed mean of one group in the
sample and the observed mean of another group in the sample
D.The discrepancy between two population parameters of
interest

Using the sample standard deviation as an estimate for the
population standard deviation, what size sample should the manager
choose if she wishes to estimate the mean number of admissions per
24-hour period to within 1 admission with 99% reliability?

Parameter Estimates
Parameter
DF
Estimate
Standard
Error
t Value
Pr > |t|
Intercept
1
-31.166890
2.880284
-10.82
<.0001
HouseholdInc
1
0.000097845
0.000027084
3.61
0.0003
DailyPM25
1
2.869205
0.147155
19.50
<.0001
PctSmokers
1
0.671836
0.048104
13.97
<.0001
PctObese
1
0.616837
0.080844
7.63
<.0001
PM25days
1
-0.244056
0.063909
-3.82
0.0001
OzoneDays
1
0.157997
0.035823
4.41
<.0001
PctDiabetic
1
1.164233
0.182226
6.39
<.0001
Regardless of the biological basis of disease or hypotheses,
statistically speaking, are any of your variables in your final
model...

A statistical estimate of the standard deviation one would
obtain from the distribution of an infinite number of estimates of
the difference between the means of two groups is the ____.
Select one:
a.
standard error of the difference
b.
estimated error
c.
regression coefficient
d.
correction factor

Confidence intervals seek to estimate a population parameter
with an interval of values calculated from an observed sample
statistic. Demonstrate that you understand this concept by
describing a situation in which one could use a sample mean or
sample proportion to produce a confidence interval as an estimate
of a population mean or population proportion. I am asking you to
make up a situation where a confidence interval might be computed.
Clearly identify the population, sample, parameter, and statistic
involved...

When constructing a confidence interval estimate for a
population mean (when the standard deviation of the population is
known), what is the calculation that has to be made to obtain the
error margin? A. You multiply the number of standard deviations by
the standard deviation of the sampling distribution of sample
means. B. You subtract the sample mean from the population mean and
then divide by the standard deviation of the population. C. You
divide the standard deviation of the...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 2 minutes ago

asked 4 minutes ago

asked 8 minutes ago

asked 8 minutes ago

asked 14 minutes ago

asked 16 minutes ago

asked 17 minutes ago

asked 28 minutes ago

asked 36 minutes ago

asked 41 minutes ago

asked 44 minutes ago