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For Questions Below Use the Following: a Researcher Suspects

Question 20

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For questions below use the following: A researcher suspects that increasing illumination increases motoric speed. A group of 7 subjects was randomly selected and tested on the Digit Symbol subtest of the WAIS-R IQ test. The same subjects were tested under three illumination conditions, low light, medium light and high light. Their scores under each condition were as follows:  Subject #  Low Light  Medium Light  High Light 1710112871036810456954476356781013\begin{array} { c c c c } \text { Subject \# } & \text { Low Light } & \text { Medium Light } & \text { High Light } \\1 & 7 & 10 & 11 \\2 & 8 & 7 & 10 \\3 & 6 & 8 & 10 \\4 & 5 & 6 & 9 \\5 & 4 & 4 & 7 \\6 & 3 & 5 & 6 \\7 & 8 & 10 & 13\end{array}
-Calculate the appropriate F ratio.

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