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. At the 10% significance level, the critical value for the test is ________.
A) 1.645
B) 1.96
C) 2.33
D) 2.575

Question

Quizplus · Accepted Answer

At the 10% significance level (two-tailed), the critical value from the standard normal distribution (Z-distribution) is 1.645. This is because the 10% significance level is split into 5% in each tail of the distribution, and the Z-score that corresponds to the upper 5% point is 1.645.

A Magician Has a Coin That May or Not Be