A researcher is studying people of normal weight and obese individuals. She wants to know how the time of day affects hunger feelings in these two groups. When, during the experiment, the researcher looks at her watch, she has introduced a/an __________ into the research study.
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When the researcher looks at her watch during the experiment, she has introduced a variable called "time of day" into the research study. The time of day is an independent variable that the researcher is interested in studying to see how it affects hunger feelings in people of normal weight and obese individuals. To investigate this, the researcher can manipulate the time of day by conducting the experiment at different times and compare the hunger feelings reported by participants at those different times. By doing so, she can determine if there are any differences in hunger feelings between the two groups at different times of the day.
