Upon enrolling in State University, freshmen are required to take an English placement exam. Over the past several years, 20% of the new students have failed the test and have been placed in remedial classes. In a sample of n = 100 students from this year's class, only 12 failed the test. We want to test whether the proportion of people who failed in the current sample is statistically different from the proportion who failed in previous years. Is the average failure rate still 20% or not? Assuming a two-tailed test, what is the null hypothesis? Continuous random variables that can assume values at all points on an interval of values, with no breaks between possible values, are quite common. Examples include: loss amount in dollars per claim on an insurance policy height ' weight ' all of the above temperature