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Twenty-five patients (group 1) with chronic lower back pain receive six months of opioid therapy and at the end of the six months have a mean pain level of 15.7 with a sample standard deviation of 4.3. A separate group of 25 patients (group 2) with chronic lower back pain received six months of daily yoga sessions and after six months have a mean pain level of 9.8 with a sample standard deviation of 4.0. We can assume that the population variances in the two groups are equal.
What best fits it?
a. Two-sample z-test
b. Two-sample (pooled variance) t-test
c. Two-sample (unpooled variance) t-test
d. Wilcoxon rank-sum test
e. Paired t-test
(a) If a score below 60 represents a grade of F (failure), approximately what percent of students failed the test?
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Suppose we are dealt five cards from an ordinary 52-card deck. What is the probability that (a) we get all four aces, plus the king of spades? (b) all five card
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Many times researchers preselect the value of alpha of .01 or .001. What are the factors that allow selection of either of those levels of significance?
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you have conducted a simple survey that has asked 100 people who have either attended an event n25 you promoted in the
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