BESC 3010 TEST TWO STUDY GUIDE
QUESTIONS WITH CORRECT
ANSWERS
The equation for the standard error of a sampling distribution is...
μ/square root of n − 1
μ /σ
σ /(n - 1)
σ /Square root of n - Answer-σ /Square root of n
If a population has a mean of 40 and a standard deviation of 9, what would the z-score
be for a sample of 9 people with a mean of 46?
4
6
2
3 - Answer-2
A sampling distribution can be calculated for...
population means only.
sample means only.
any unbiased statistic.
any sample statistic. - Answer-any sample statistic.
What is the standard error of a distribution if \sigma σ = 10 and n = 100?
10
0.1
0.01
1 - Answer-1
If a population has a mean of 60 and a standard deviation of 8, what is the z-score for a
sample of 144 people with an average of 62?
2
2/3
12
3 - Answer-3
As the size of samples (n) in a sampling distribution increases, the shape of that
distribution becomes more...
similar to the original population distribution.
variable.
normal.
, uniform. - Answer-normal
In statistics, "estimation" refers to using sample data to...
determine the effects of missing data in the sample.
calculate the sample variance.
calculate the degrees of freedom.
infer a population parameter. - Answer-infer a population parameter.
What is one important difference between a point estimate and a confidence interval?
The confidence interval can be used only for unbiased statistics but a point estimate
can be used for any kind of statistics
The point estimate is based on sample data instead of population data
The point estimate cannot be used for inferring population values
A point estimate gives a single value but a confidence interval gives a range of values -
Answer-A point estimate gives a single value but a confidence interval gives a range of
values
As n increases, the point estimate for the mean will...
become more precise.
become less biased.
become higher.
not change. - Answer-not change
Imagine a sample with n = 16 and a mean of 52 that comes from a population with a
standard deviation of 12. Based on these data, what would be the 95% confidence
interval for the population mean? (Use z-scores of \pm ± 1.96 for the 95% confidence
level.)
(40, 64)
(50.04, 53.96)
(46.12, 57.88)
(28.48, 75.52) - Answer-(46.12, 57.88)
Imagine that two samples - Sample A with n = 10 and Sample B with n = 50 - are drawn
from the same population and confidence intervals are computed for the same
variables, which sample will have the narrower confidence interval?
They will be the same
Sample B
Sample A
Cannot answer without additional information - Answer-Sample B
If you can use only one number to estimate a population parameter, then the best value
is a...
confidence interval.
null hypothesis.
probability value.
point estimate. - Answer-point estimate.
QUESTIONS WITH CORRECT
ANSWERS
The equation for the standard error of a sampling distribution is...
μ/square root of n − 1
μ /σ
σ /(n - 1)
σ /Square root of n - Answer-σ /Square root of n
If a population has a mean of 40 and a standard deviation of 9, what would the z-score
be for a sample of 9 people with a mean of 46?
4
6
2
3 - Answer-2
A sampling distribution can be calculated for...
population means only.
sample means only.
any unbiased statistic.
any sample statistic. - Answer-any sample statistic.
What is the standard error of a distribution if \sigma σ = 10 and n = 100?
10
0.1
0.01
1 - Answer-1
If a population has a mean of 60 and a standard deviation of 8, what is the z-score for a
sample of 144 people with an average of 62?
2
2/3
12
3 - Answer-3
As the size of samples (n) in a sampling distribution increases, the shape of that
distribution becomes more...
similar to the original population distribution.
variable.
normal.
, uniform. - Answer-normal
In statistics, "estimation" refers to using sample data to...
determine the effects of missing data in the sample.
calculate the sample variance.
calculate the degrees of freedom.
infer a population parameter. - Answer-infer a population parameter.
What is one important difference between a point estimate and a confidence interval?
The confidence interval can be used only for unbiased statistics but a point estimate
can be used for any kind of statistics
The point estimate is based on sample data instead of population data
The point estimate cannot be used for inferring population values
A point estimate gives a single value but a confidence interval gives a range of values -
Answer-A point estimate gives a single value but a confidence interval gives a range of
values
As n increases, the point estimate for the mean will...
become more precise.
become less biased.
become higher.
not change. - Answer-not change
Imagine a sample with n = 16 and a mean of 52 that comes from a population with a
standard deviation of 12. Based on these data, what would be the 95% confidence
interval for the population mean? (Use z-scores of \pm ± 1.96 for the 95% confidence
level.)
(40, 64)
(50.04, 53.96)
(46.12, 57.88)
(28.48, 75.52) - Answer-(46.12, 57.88)
Imagine that two samples - Sample A with n = 10 and Sample B with n = 50 - are drawn
from the same population and confidence intervals are computed for the same
variables, which sample will have the narrower confidence interval?
They will be the same
Sample B
Sample A
Cannot answer without additional information - Answer-Sample B
If you can use only one number to estimate a population parameter, then the best value
is a...
confidence interval.
null hypothesis.
probability value.
point estimate. - Answer-point estimate.
