In mathematics interval is a set of real numbers with the property that any number that lies between 2 numbers in the set is also included in the set. Set-Builder Notation looks like this. A bigger number will always be found to the right of a smaller number.
Identify the intervals to be included in the set by determining where the heavy line overlays the real line.
The rejection region for the hypothesis test is all numbers larger than 73 hours. Now an inequality uses a greater than less than symbol and all that we have to do to graph an inequality is find the the number 3 in this case and color in everything above or below it. Set builder and interval notation from a number line. Inequality where x indicates the variable being described and inequality is written as an inequality normally in its simplest form.