A Statistics Teacher Wants to See If There Is Any

question 10

Multiple Choice

A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information. ​ What is the conclusion that can be reached about the difference in the average final examination scores between the two classes? (Use a .05 level of significance.)

• A) There is a statistically significant difference in the average final examination scores between the two classes.
• B) There is no statistically significant difference in the average final examination scores between the two classes.
• C) It is impossible to make a decision on the basis of the information given.
• D) The students who enrolled in statistics today are the same students who enrolled five years ago.

---

Definitions:

Confounds

Variables that could potentially contaminate or influence the outcome of an experiment, making it hard to interpret the effects of the primary variables of interest.

Factorial Design

An experimental strategy in which factors are varied together to examine their interaction effects on a response variable.

Independent Variables

Variables that are manipulated or changed in an experiment to test their effects on dependent variables.

Dependent Variable

The variable in an experiment that is observed and measured for changes, which are thought to be influenced by the manipulation of the independent variable.