An Instructor Gives Weekly Tests to One Class and Just

question 84

Multiple Choice

An instructor gives weekly tests to one class and just one midterm exam to another class. Both classes get the same final exam. The instructor compares performances on the final exam to see whether the weekly tests affected students' performance. What is the independent variable in this experiment?

• A) the number of tests before the final
• B) the students' performance on the final exam
• C) the difficulty of each test
• D) the number of students in each class

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Definitions:

Normal Random Variable

This variable is described by a distribution that has a graph in the shape of a bell curve, indicating its probability density function is symmetrical around its mean.

Standard Deviation

The statistic that quantifies the dispersion of a set of data points around their mean; it measures how spread out the values in the dataset are.

Percentile

A measure used in statistics indicating the value below which a given percentage of observations in a group of observations fall.

Standard Normal Distribution

A special case of the normal distribution with a mean of zero and a standard deviation of one.