13 multichoice question of stats 5 minute task
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Homework
1
Using inferential statistics creates which of the following problems for researchers?
A
Statistical error
B
Sampling error
Answer:
Homework
2
One-way researchers can address the problem of sampling error is by using a good, nonbiased sampling procedure.
A
True
B
False
Answer:
Homework
3
Which of the following would create a distribution of sample means?
A
Taking all possible combinations of people from a population and computing their mean
B
Taking 100 samples from a population and computing their mean
C
Taking all possible combinations of four people (i.e., all samples of 4) from a population and computing each sample’s mean
Answer:
Homework
4
The mean of the distribution of sample means is _____ and the standard deviation of the distribution of sample means is _____.
A
the population mean; the population standard deviation
B
the standard error of the mean; the population standard deviation
C
the population mean; the standard error of the mean or typical amount of sampling error a study is likely to have
Answer:
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5
The shape of a distribution of sample means will:
A
have the same shape as the population.
B
approach a normal shape as the sample size increases.
C
approach a normal shape as the sample size decreases.
Answer:
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6
The central limit theorem only describes a distribution of sample means for populations of scores that are normally distributed.
A
True
B
False
Answer:
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7
The standard error of the mean is the:
A
typical discrepancy between all possible sample means of a given size and the population mean.
B
discrepancy between a single score and a sample statistic.
Answer:
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8
The typical amount of sampling error is the:
A
standard deviation of the distribution of sample means.
B
standard error of the mean.
C
Both of the above
Answer:
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9
Which of the following will reduce the standard error of the mean?
A
Increasing N
B
Decreasing N
C
Both increasing and decreasing N can reduce the standard error of the mean.
Answer:
Homework
10
According to the law of large numbers, as sample size increases, the sample mean tends to get closer to the population mean.
A
True
B
False
Answer:
Homework
11
When computing a z for a sample mean, if the z score is close to zero the sample mean was:
A
not very different from the population mean and the difference was probably due to sampling error.
B
very different from the population mean and the difference was probably created by something other than sampling error.
Answer:
Homework
12
When computing a z for a sample mean, if the z score is far from zero the sample mean is:
A
not very different from the population mean and the difference was probably due to sampling error.
B
very different from the population mean and the difference was probably created by something other than sampling error.
Answer:
Homework
13
This example illustrates that the z for a sample mean procedure
A
can be used to identify if the discrepancy between a sample mean and a population mean is likely or unlikely to be due to sampling error.
B
is only useful in a controlled laboratory setting.
C
Both a and b are correct.
A
Answer:
Homework
14
The probabilities produced by most research studies are considered estimates (i.e., not exact probabilities) because:
A
most research studies do not use truly random samples.
B
most research studies use samples that are too small.
