Medical Statistics at a Glance
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Wiley-Blackwell

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Chapter 23, Question 1.
Sign test

Select all of the following statements which you believe to be true. The sign test can be used when:

We have a single sample of observations on a numerical variable, and we wish to test the null hypothesis that the median in the population equals a particular value.
We have a single sample of individuals, each individual either having or not having a characteristic of interest, and we wish to test the null hypothesis that the proportion of individuals in the population with the characteristic is equal to a particular value which is less than one half.
We have two paired samples of observations, the response for each pair being recorded as a preference for one member of the pair or no preference for either, and we wish to test the null hypothesis that the proportion of preferences of a certain type in the population is equal to one half.
We have two paired samples of observations on a numerical variable, and we wish to test the null hypothesis that the median of the differences between the responses for the pairs in the population equals zero.
We have two paired samples of observations on a numerical variable, and we wish to test the null hypothesis that the signs of the differences between the responses for the pairs in the population are positive.