AP Statistics / Mr. Hansen
2/13/2001

Name: _________________________

Worksheet on §9.3

This is a homework assignment that will help prepare you for the §9.3 mini-quiz on 2/14/2001.

 

The distribution of scores for persons over 26 years of age on the Wechsler Adult Intelligence Scale (WAIS) is approximately normal with mean 100 and standard deviation 15. The WAIS is one of the most common "IQ" tests for adults.

1.

What is the probability that a randomly chosen individual has a WAIS score of 105 or higher?
   
   
   
   

2.

What are the mean and standard deviation of the mean WAIS score for an SRS of 60 people?
   
   
   
   

3.

What is the probability that the average WAIS score of an SRS of 60 people is 105 or higher?
   
   
   
   

4.

Would your answers to 1, 2, or 3 be affected if the distribution of WAIS scores in an adult population were distinctly nonnormal?