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STATISTICS UNIT 3

Contingency Tables
General contingency tables
1. Always start by writing your H0 and H1. In the case of contingency tables, you write weather the
two variables are dependent or independent of each other.
Remember: H0 is the null hypothesis. This means…

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Yates correction (2 x 2)
1. Always start by writing your H0 and H1. In the case of contingency tables, you write weather the
two variables are dependent or independent of each other.
Remember: H0 is the null hypothesis. This means that H0 will…

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Distribution-free methods for single samples and paired
comparisons
The sign test
1. With the sign test, you will be given a population median. Always start by writing your H0 and H1.
Say for example your population median is 500, your H0 and H1 for…

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H0 Population median = 300
H1 Population median 300
Remember: H0 is the null hypothesis. This means that H0 will always have no change. This means, in
the case of the sign test, H0 will always be `Population median = x'
2. You…

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Paired sample Wilcoxon signed-rank test
1. Always start by writing your H0 and H1. Because you are not given a population median, your H0
and H1 for a two tailed test will be:
H0 Population median difference = 0
H1 Population median difference 0…

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Distribution-free methods for two or more unpaired samples
Man-Whitney U Test
1. Always start by writing your H0 and H1.
Say for example, we are talking about the difference in cholesterol in men and women.
For a two tailed test your hypothesis would be:…

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6. The critical value comes from the degrees of freedom which are simple:
(k-1)
k is the number of samples. Because this test is always 1 TAILED, you would look up the upper tail
of your significance level. So if it was a 5%…

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2. The exam question may ask you to state H0 and H1. In any case, they would be:
H0 Ranks in population are independent.
H1 Ranks in population are dependent.
Remember: H0 is the null hypothesis. This means that H0 will always have no…

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