Exhibit 20.12.A magician has a coin that may or not be fair.The results of 30 flips of the coin are: H H T H T H H T H H T H H T H T H H H T T T T T H H H H H T. Refer to Exhibit 20.12.For the Wald-Wolfowitz runs test,the value of R is:
A)8
B)11
C)16
D)19

Question

Quizplus · Accepted Answer

The Wald-Wolfowitz runs test involves counting the number of runs (defined as a sequence of consecutive H or T) in the data. For this data set, the runs are: H H, T, H, T, H H, T, H H, T, H H, T, H H, T, H, T, H H H, T T T T, H H H H, T. Counting the number of runs, we get R = 11. Therefore, the answer is B.