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BESC 3010 - TEST 2 Questions & Answers
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BESC 3010 - TEST 2 Questions & Answers
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BESC 3010 - TEST 2 Questions &Answers
A researcher who wants to use a z-test to compare a sample mean to a population mean must
first... Correct Ans-Know the population standard deviation
If you draw a picture of the null distribution with the critical values and regions of rejection
marked, then the alpha level is represented by... Correct Ans-The proportion of the
distribution in the regions of rejection
If a researcher believes that the null hypothesis is false and wants to have the greatest chance
of rejecting it with their study, then which of the following would make it more likely that the
null hypothesis would be rejected? Correct Ans-Increasing n
If a researcher used a one-sample z-test to determine whether an experimental group was
different from a general population, what she would actually be testing is... Correct Ans-
Whether their means are different
When calculating an effect size for the z-test... Correct Ans-It is most common to use Cohen's
d
A Type I error is also called... Correct Ans-A false positive
Which level of alpha for a hypothesis test has the lowest risk of a Type I error? Correct Ans-
.01
If a researcher is using an critical value of +1.96 for a z-test and gets an observed z (i.e., test
value) of +0.55 for a sample of n = 40, then the researcher should... Correct Ans-retain (i.e.,
fail to reject) the null hypothesis.
, Imagine two studies that are identical in every respect except the size of their samples. Sample
A has an effect size of d = .40 and p-value of .001. Sample B also has an effect size of d = .40 but
a p-value of .10. Which sample likely had the larger sample size? Correct Ans-Sample A
If a person's blood sample tests positive for a disease when, in fact, the person does not have
the disease, then... Correct Ans-a Type I error has occurred
If a researcher is using alpha = .01 and gets a p-value for the z-test of p = .005, then... Correct
Ans-the researcher should conclude that the results are unlikely to occur by chance if the null
hypothesis is true.
In order to compute a one-sample z-test you must... Correct Ans-Know the population
standard deviation
If a sample's mean really is different from the comparison population's mean, then what is the
easiest way to make sure that the null hypothesis would be rejected? Correct Ans-Getting as
large a sample as possible
one reason that researchers nearly always gather data from samples of participants instead of
entire populations is because.... Correct Ans-It can be impractical or even impossible to
study populations
If a test has a population mean of 70 and standard deviation of 6, then what is the z-score for a
sample of n = 9 with a mean of 76? Correct Ans-3
The central limit theorem says that when all possible samples of a sufficient size are taken from
a population and their means are charted, the distribution of means will be... Correct Ans-
Normally distributed
The distribution of all possible samples of a given size (e.g., n=54 or n=117) are taken from a
population and their means are charted, that distribution is known as... Correct Ans-The
sampling distribution of means
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