Some pig farmers are interested in how well their breeding program is going. So one breeding season they recorded how many piglets there were in each litter.

For a total of 30 litters they found that 7 of the litters contained no more than 11 piglets, 14 of the litters contained at least 13 piglets and 9 of the litters contained exactly 12 piglets.

Suppose a sign test is carried out to test the hypothesis that the median size of a litter is 12. Select the TWO statements which are TRUE.

Select one or more:

The test statistic is 9.

The test statistic is 21.

The test statistic is 7.

The sample size that should be used in the test is 9.

The test statistic is 14.

The sample size that should be used in the test is 21.

The sample size that should be used in the test is 30.

The test statistic is 5.

The test statistic is 30.