For Each of the Following Statements, State the Population Parameter

Essay

For each of the following statements, state the population parameter of interest, state the appropriate null and alternative hypotheses and indicate whether the appropriate test will be a two-tailed, a left tailed or a right tailed test.
a. The average age a person registers to vote in Australia is greater than 20 years.
b. A minority of office workers purchase their morning coffee.
c. The average number of hours spent on a computer per day.
d. The majority of students in a particular university course who attend lectures has changed from 75%, since lecture recordings have become freely available to students.