Exhibit 7-4: a Group of Researchers Has Developed a Method

question 84

Multiple Choice

Exhibit 7-4: A group of researchers has developed a method that they hypothesize will improve physics test scores.They randomly selected nine students to participate in their study.The nine students were administered an ACT test, trained in the new method, and then administered an alternate form of the ACT test.The following data are their scores:
$\begin{array}{lll}\text {Subject } & {\text {Test 1 }}{} & \text {Test 2 } \\ 1 & 20 & 19 \\ 2 & 20 & 20 \\ 3 & 24 & 21 \\ 4 & 24 & 24 \\ 5 & 24 & 22 \\ 6 & 17 & 15 \\ 7 & 18 & 15 \\ 8 & 18 & 16 \\ 9 & 20& 18\end{array}$
-Refer to Exhibit 7-4.The test is statistically significant at what level?

• A) .05
• B) .01
• C) .001
• D) It is not significant.

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Definitions:

Weber's Law

A principle in psychology that states the smallest change in a stimulus that can be detected is a constant proportion of the original stimulus's intensity.

Adaptation

The process by which organisms adjust and change to their environment for survival and reproduction.

Stimulus Habit

The development of a repeated, automatic response to a specific stimulus over time.

Attention

The act of concentrating on a specific object, task, or activity while ignoring irrelevant information or distractions.