g. With which p level-0.05 or 0.01 reject the null hypothesis? Explain.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Topic Video
Question
Answer part f,g,h
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Transcribed Image Text:wondered whether a sample of Canadian adults had
different scores than adults in England. If they were
different, the English norms would not be valid for
use in Canada. The mean for 30 Canadian adults was
17.5. For the purposes of this exercise, assume that the
standard deviation of the adults in England is 3.2.
a. Conduct all six steps of a z test. Be sure to label all
six steps.
b. Some words on the GNT are more comi
used in England. For example, a mitre, the headpiece
worn by bishops, is worn by the archbishop of Can-
terbury in public ceremonies in England. No Cana-
dian participant correctly responded to this item,
whereas 55% of English adults correctly responded.
Explain why we should be cautious about applying
norms to people different from those on whom the
test was normed.
only
When we conduct a one-tailed test instead of
two-tailed test, there are small changes in steps
and 4 of hypothesis testing. (Note: For this example,
assume that those from populations other than the
one on which it was normed will score lower, on
average. That is, hypothesize that the Canadians will
have a lower mean.) Conduct steps 2, 4, and 6 of
hypothesis testing for a one-tailed test.
C.
21

Transcribed Image Text:d. Under which circumstance-a one-tailed or a two-
tailed test-is it easier to reject the null hypothesis?
Explain.
e. If it becomes easier to reject the null hypothesis
under one type of test (one-tailed versus two-
tailed), does this mean that there is a bigger differ-
ence between the groups with a one-tailed test than
with a two-tailed test? Explain.
f. When we change the p level that we use as a cut-
off, there is a small change in step 4 of hypothesis
testing. Although 0.05 is the most commonly used
p level, other values, such as 0.01, are often used.
For this example, conduct steps 4 and 6 of hypoth-
esis testing for a two-tailed test and p level of 0.01,
determining the cutoff and drawing the curve.
g. With which p level-0.05 or 0.01-Is it easiest to
reject the null hypothesis? Explain.
h. If it is easier to reject the null hypothesis with cer-
tam p levels, does this mean that there is a bigger
difference between the samples with one p level
versus the other p level? Explain.
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