1.We want to test whether the mean height of eighth graders is 66 inches. State the null and alternative hypotheses. Fill in the correct symbol (=, #, 2, ) for the null and alternative hypotheses. Ho: H 66 Ha: H 66 2. A particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs to be replaced. From past studies of this tire, the standard deviation is known to be 8,000. A survey of owners of that tire design is conducted. From the 28 tires surveyed, the mean lifespan was 46,500 miles. What are the null and alternative hypotheses? 3. Explain Type I and Type II errors