The sign test is a very simple procedure for testing hypotheses about a population median assuming only that the underlying distribution is continuous. To illustrate, consider the following sample of 20 observations on component lifetime (hr):
![](https://test.transtutors.com/qimg/f0cd493b-f631-4b1c-a914-34f9ecf0c731.png)
test statistic is Y = the number of observations that exceed 25.
a. Determine the P-value of the test when Y = 15.
b. For the given data, should H0 be rejected at significance level .05?