Question 1
A normal approximation can be used in the Wilcoxon signed-rank test if:
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\(\style{font-family:Times New Roman;}{np>5}\).
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\(\style{font-family:Times New Roman;}{n\geq20}\).
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\(\style{font-family:Times New Roman;}{n\geq30}\).
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\(\style{font-family:Times New Roman;}{e_i\geq5}\)for all categories.
Question 2
A normal approximation for the Wilcoxon rank-sum test is appropriate when:
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\(\style{font-family:Times New Roman;}{n_1\text{ and}\;n_2\geq20}\).
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\(\style{font-family:Times New Roman;}{n_1\;\text{and}\;n_2\geq8}\).
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\(\style{font-family:Times New Roman;}{n\geq30}\).
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\(\style{font-family:Times New Roman;}{e_i\geq5}\)for all categories.