An Observational Study:
A) Analyzes Data Already Available
B) Makes

question 16

Multiple Choice

An observational study:

• A) analyzes data already available
• B) makes it possible to rule out factors over which the researcher has no control for the observed effects
• C) examines individuals that have been selected by the researchers
• D) allows researchers to control for all extraneous factors
• \[\begin{array} { | l | c | c | c | c | c | c | }
• \hline \text { ANOVA } \\
• \hline \text { Source of Variation } & \text { SS } & \boldsymbol { d f } & \boldsymbol { M S } & \boldsymbol { F } & \boldsymbol { P } \text {-value } & \boldsymbol { F } \text { crit } \\
• \hline \text { Between Groups } & & 1 & 44082.89 & 263.86 & 0.00 & 4.23 \\
• \hline \text { Within Groups } & 4343.79 & 26 & 167.07 & & & \\
• \hline \text { Total } & 48426.68 & 27 & & & & \\
• \hline
• \end{array}\]

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