Dr Kangwadi is conducting a study to test the effect of a new drug on people's ability to concentrate at work. His research sample consists of 100 South African adults. During a 14-week period, half of the sample is administered the drug and the other half is administered a placebo, and participants' concentration abilities are continually tracked. In the context of this study, if Dr Kangwadi uses random assignment, it means that ____.

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each research participant has an equal chance of being assigned to each level of the independent variable

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the 100 adults in his study are likely to be representative of the larger population of interest

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his research findings are likely to be statistically significant

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his study will be high in external validity

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Dr Kangwadi is conducting a study to test the effect of a new drug on people's a...

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