The average IQ is 100. Below is a sample of 8 left-handed individuals who have been given an IQ test. Test the hypothesis that left-handed individuals have different IQs than the average American. Use an alpha level of .01

IQ: 120, 110, 110, 100, 121, 90, 100, 90

What is the appropriate test?

State the null hypothesis:

State the Alternative Hypothesis:

What is (are)the critical values?

Calculate the obtained statistic.

Make a Decision:

Retain Null

Reject Null

What does your decision mean?