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The test statistic for a sign test is the smaller of the number of positive or...

The test statistic for a sign test is the smaller of the number of positive or negative signs. True False

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Expert Solution

The given statement is incorrect.

The signs test is an example of non-parametric test which is used to test if the population median is equal to some particular value, say . Let

denote the number of observations that are greater than

denote the number of observations that are lesser than

Logically, if the null hypothesis is assumed to be true, then, the number of observations which are greater than must be equal to number of observations smaller than , thus, implying that both and follow the Binomial distribution with parameters, and  .

The test statistic for the signs test, is:

Now the p-value (that is the probability of obtaining a value greater than or equal to ) will be computed using the Binomial distribution and compared with the level of significance, , to make a decision regarding the acceptance (if p-value > ) or the rejection (if p-value < ) of the null hypothesis.

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milcah answered 2 years ago
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