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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
Imagine that samples - Sample A with n = 20 and Sample B with n = 200 - are drawn from the
same population and confidence intervals are computed for the same variables, which sample
will likely have the more precise confidence interval? Correct Ans-Sample B
How is a confidence interval affected when the sample standard deviation decreases?
Correct Ans-It becomes narrower
When the range of confidence for a confidence interval becomes lower - from 90% to 80%, for
example - then the confidence interval will... Correct Ans-Become narrower
What is the point estimate for the population mean if the population standard deviation is 24,
the sample size is 36, and the sample mean is 110? Correct Ans-110
As the mean for a distribution increases, then the width of the corresponding confidence
interval will... Correct Ans-Stay the same
Imagine a sample with n = 49 and a mean of 60 that comes from a population with a standard
deviation of 7. Based on these data, what would be the 99.9% confidence interval for the
population mean? (Use z-score of +3.29 for the 99.9% confidence level.) Correct Ans-(56.71,
63.29)
The sample mean is ________ and a confidence interval for the mean is _______. Correct
Ans-a descriptive statistic; an inferential statistic
Which is more precise (in the statistical sense): a point estimate or a confidence interval?
Correct Ans-A point estimate
, If a researcher wants to test whether an experimental group is different from the general
population, the she would test... Correct Ans-the null hypothesis of no difference between
the group and the population.
In a two-tailed or non-directional test, if the critical value has a greater absolute value than the
observed (or test) value does, the the null hypothesis... Correct Ans-is not rejected (i.e.,
retained).
When calculating an effect size for the z-test... Correct Ans-the sample size is irrelevant.
What does it mean when the result of a z-test is called "statistically significant"? Correct Ans-
The alpha value was greater than p-value
A Type I error occurs when... Correct Ans-The sample data lead us to reject a null hypothesis
that is true
A Type II error occurs when... Correct Ans-the sample data lead us to retain (i.e., fail to
reject) a null hypothesis that is false.
When choosing a level of alpha for a hypothesis test, unless you have a compelling reason to do
otherwise, you should use... Correct Ans-.05
If a researcher is using an alpha of .05 for a z-test and gets an observed (or test) p-value of .23,
then the researcher should... Correct Ans-retain (i.e., fail to reject) the null hypothesis
If a researcher is using an critical value of ±1.96 for a z-test and gets an observed (or test) z of -
1.73, then the researcher should... Correct Ans-retain (i.e., fail to reject) the null hypothesis.
Imagine that a researcher is interested in whether residents in his local area have higher levels
of well-being than the national average. What would be an appropriate alternate hypothesis for
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