Refer to the Following Breakdown of Responses to a Survey

question 118

Multiple Choice

Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?" What is the class interval for the preceding frequency table?

• A) 10
• B) 20
• C) 40
• D) None Apply

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Definitions:

Population Mean

The average value of all the members of a set or population, denoting the central tendency.

Null Hypothesis

An assumption made for a statistical test that there is no significant difference or effect, to be tested against the alternative hypothesis.

Equality Sign

A symbol used in mathematics to indicate that two expressions on either side of the sign are equal in value.

Type I Error

The mistake of rejecting the null hypothesis when it is actually true, falsely indicating a significant effect or difference.