# QNT 275 Final Exam Section 1 – Variable to Predict another Variable

**What is the name of the variable that’s used to predict another variable? **

Explanatory

Explanation: An explanatory variable, sometimes called a predictor, is a special type of independent variable that is used to measure another variable. An example of this an action is a study about the effectiveness of a body building supplement. The explanatory variable would be the dosage of the supplement, while the response variable would be the change in muscle growth.

**Salary Distribution of Professors**

Professors at a local university earn an average salary of $80000 with a standard deviation of $6000. The salary distribution is approximately bell-shaped. What can be said about the percentage of salaries that are at least $74,000?

About 84 percent

Explanation: A bell shaped curve is an example of a normal distribution that can be broken down into a set of percentages. In this example, we total all values that are about -1 deviation from the center of the curve, which results in approximately 84% of the total teacher salaries in this example.

**What type of relationship is indicated in the scatterplot? **

Use the following the steps below to quickly determine any scatterplot relationship.** **

- If the points cluster from lower left to upper right – positive correlation.
- If the points cluster from upper left to lower right – negative correlation.
- If the points cluster in a straight line – linear.
- If the points cluster in a curved non-straight line – curvilinear.
- If there is no clustering – no relationship.

**The study of statistics can be defined as:**

the art and science of getting information from data.

the language of data.

the study of collecting, analyzing, presenting, and interpreting data.

**Student:**Regina Austin**Textbook:**Statistical Techniques in Business**Course:**QNT/275