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?


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. 

  1. If the points cluster from lower left to upper right – positive correlation.
  2. If the points cluster from upper left to lower right – negative correlation.
  3. If the points cluster in a straight line – linear.
  4. If the points cluster in a curved non-straight line – curvilinear.
  5. 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

Statistics is Hard! Check out the Entire QNT 275 Study Sheet


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