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Homework for introduction to statistical testing  section 6.2 part 1
1.
Here are some published examples of statistical tests.
In each example
identify
a. the claim (= the alternate hypothesis),
b. the null hypothesis,
c. the sample size, and
d. Was there strong evidence for the claim?
(yes or no)
Notice that in published papers, the null hypothesis is not stated, but is left to the reader
to figure out.
A.
“ We conducted a randomized, placebocontrolled trial to assess the efficacy of
arthroscopic surgery of the knee in relieving pain.
..
A total of 180 patients underwent
randomization.
...
At no point did either [surgery] group have greater pain relief than the placebo
group.
For example, there was no difference in knee pain between the placebo group
and the lavage [surgery] group .
..at one year (mean scores 48.9 and 54.8).
..P
= .14 for
the comparison with the lavage group.”
B.
“In a randomized, doubleblind clinical trial, ofloxin was superior to the placebo, with
an improvement rate of 86%”
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This note was uploaded on 09/23/2011 for the course MATH 324 taught by Professor Staff during the Spring '08 term at S.F. State.
 Spring '08
 Staff
 Statistics, Probability

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