Chapter 13, Problem 37E

a)

To determine

To explain the randomization procedure.

Explanation of Solution

First need to Arrange the 20 containers in 20 separate locations. Then we need to use a random-number generator to identify the 10 containers that should be filled with water.

b)

To determine

To explain whether the level of success is statistically significant.

Answer to Problem 37E

Not statistically significant.

Explanation of Solution

If the dowser would be guessing then we would expect that he answered about 50% correctly. Therefore, the dowser answered 12 out of 20 which is 60% correctly which not statistically significant.

c)

To determine

To explain how many correct identifications needed to convince.

Answer to Problem 37E

About 80% to 100%.

Explanation of Solution

There should be high level of successes needed. That is, more than 16 correct identification needed to convince that the forked-stick trick works.