A Portland high school wanted to see if reading test scores have changed in the past 30 years by testing a random sample of 25 students to see whether there is a significant change from the average score of 78 thirty years ago. The sample yields a mean and standard deviation of 84 and 8 respectively. What is the unknown parameter of interest in this example?
The unknown parameter of interest in this example is the value of the change in the Portland high school population reading test score in the past 30 years.
