Type I Error

6. A research analyst believes that average back-to-school spending is less than a trade group’s prediction of $606.

a. Write the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)\

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b. Is this a right-tailed, left-tailed, or two-tailed test? (2 pts)\

7. A study found that, in 2005, 12.5% of workers belonged to unions. Suppose a sample of 400 workers is collected in 2006 to determine whether union efforts to organize have increased union membership. The sample result show that 68 of the workers belonged to unions. State the null hypothesis Ho and alternative hypothesis Ha. (2.5 pts)

8. Consider the null hypothesis Ho: The man is innocent of crime. Ha: The man is guilty of crime.

a. What is the Type I error? (2.5 pts)

b. What is the Type II error? (2.5 pts)

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