<em>Answer:</em>
<em>Reject the null, there is a difference</em>
<em>Explanation:</em>
<em>As per the question, if the given conclusion were incorrect then the error that the researcher has made was rejecting the null hypothesis as it states that there is a difference in characteristics of a mentioned population.</em>
<em>In statistics, the null hypothesis is described as one of the distinct types of hypotheses that is being used in statistics and states that is majorly no difference between the characteristics of a mentioned population or any process that involves data gathering or generating</em>

Stay in a place with a lot of <em><u>Facilities</u></em><em><u>.</u></em>
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National Grange of the Order of Patrons of Husbandry
Answer:
control group
Explanation:
In this scenario, it can be said that Bob is in the control group of the experiment. In an experiment, the control group is the group that does not receive the variable that is being tested and instead receives a placebo that does not have any effect on the test subject, thus allowing the researchers to control the outcome of that group and compare it with the other groups. Which in this case the variable being tested is Ritalin.