The national mean annual salary for a school administrator is $90,000 a year. A school official took a sample of 25 school administrators in the state of Ohio to learn about salaries in that state to see if they differed from the national average.

Missing part of question

Formulate hypotheses that can be used to determine whether the population mean annual administrator salary in Ohio differs from the national mean of $90,000.

Step-by-step explanation:

Given

-- sample size

--- mean

Required

Formulate a hypothesis

First, the mean annual salary is: $90,000

This represents the null hypothesis

So:

To determine if the mean differs implies that

This represents the alternate hypothesis

So:

So, the null and alternate hypotheses are:

-4

step-by-step explanation:

(-4+8)=-(4-8)=-8+4=-4