Question

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?

Answer 1

Explanation:

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.