1. For each claim, state H0 and Ha in words and in symbols. Then determine whether the hypothesis test is a left-tailed test, right-tailed test, or two-tailed test. Sketch a normal sampling distribution and shade the area for the P@ value.
1. A school publicizes that the proportion of its students who are involved in at least one extracurricular activity is 61%.
2. A car dealership announces that the mean time for an oil change is less than 15 minutes.
3. A company advertises that the mean life of its furnaces is more than 18 years.
2. For each claim, state H0 and Ha in words and in symbols. Then determine whether the hypothesis test is a left-tailed test, right-tailed test, or two-tailed test. Sketch a normal sampling distribution and shade the area for the P@ value.
1. A consumer analyst reports that the mean life of a certain type of automobile battery is not 74 months.
2. A realtor publicizes that the proportion of homeowners who feel their house is too small for their family is more than 24%.
a. Write H0 and Ha in words and in symbols.
b. Determine whether the test is left-tailed, right-tailed, or two-tailed.
c. Sketch the sampling distribution and shade the area for the P@ value. Answer: Page