You are asked to determine whether or not brunette students

You are asked to determine whether or not brunette students have a higher IQ score than other students. To do so, you administer an IQ test to a random sample of 300 brunette students. It is known that the national average IQ score of students is 100. Your sample produces an average IQ score of 101, with a standard deviation of 12 points. The level of significance is a = .05. Match the following:

1.the null hypothesis

2.the alternative hypothesis

3.the standard error

4.the critical test score

5.the test statistic

6.your conclusion

With...

u =100

u100

u>100

u<100

.69

.97

1.45

1.645

1.98

3.42

Conclusion: Brunette students have a significantly higher IQ than other students.

Conclusion: Brunette students have a significantly lower IQ than other students.

Conclusion: Brunette students do not have higher IQ scores than other students.

Solution