There are two coins, one fair and one weighted to fall heads with probability .9. A coin is selected, we don't know which one; H0 is that it is the fair coin and Ha is that it is the weighted coin. We will ?ip the coin 20 times, the test statistics is X = number of heads, and we reject H0 if X = 20. Compute α, β , and the power for this test. Will this test be helpful?