Chapter 9. The Basics of Experimentation and Testing for a Difference Between Means
Name:
Class:
Date:
From Kiess and Green’s
Statistical Concepts for the Behavioral Sciences , 4/e
Assignment 9.1
The purpose of this assignment is to help you to become more comfortable in recognizing
what each statistical symbol and formula in Chapter 9 represents. For each item in the
table below, either the term or the definition is given. Complete the table with the missing
information. For example, for the
between-subjects design
, write the definition in the
appropriate column. It is best to complete this page without looking at your notes or
textbook. Once you have completed it, refer back to your notes and textbook to verify
you are correct.
Term
Definition
Between-subjects design
Within-subjects design
The probability of failing to find a statistically significant
difference when one is actually there
Obtaining subjects from among people who are accessible or
convenient to the researcher
Extraneous variables
The amount a sample mean differs from its population mean
Confound
Groups in which the subjects are not expected to differ in any
systematic or consistent way
Alternative hypothesis
Standard deviation of a theoretical sampling distribution of
1
2
X
X
−
Random assignment
Developed for measuring the effect of the independent
variable on the dependent variable
Statistically significant
difference

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