150 patients with Crohn’s disease are given an experimental treatment in which they all drink “cocktails” containing thousands of pinworm eggs. Within one week, 72% of the patients report a reduction in their abdominal pain. Fill in the following table. Is there a control
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150 patients with Crohn’s disease are given an experimental treatment in which they all drink “cocktails” containing thousands of pinworm eggs. Within one week, 72% of the patients report a reduction in their abdominal pain.
Fill in the following table.
Is there a control treatment (and, if so, what is it)? |
|
Is there any accounting for individual variation? |
|
Is there repetition in the experiment? |
|
What, if any, confounding variables are not addressed in the experiment? |
|
Can we say with some confidence that ingesting pinworm eggs is an effective treatment for the symptoms of Crohn’s disease?
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- A study at a Southern university reported that the average final exam grade of students who chose to enroll in an online version of a class was equal to that of students who took the class on-campus from the same professor. Fill in the following table. Is there a control treatment (and, if so, what is it)? Is there any accounting for individual variation? Is there repetition in the experiment? What, if any, confounding variables are not addressed in the experiment? Can we say with some confidence that on-line learning is as effective as traditional in-class learning?In a controlled experiment, all of the variables are kept the same in order to be consistent. There is only one variable that is changed for these kinds of studies, and it is known as the __________ ___________ (2 words).For the trichome selection experiment, the null hypothesis is that there will be no difference between the mean number of trichomes in the second generation compared to the parent generation. The following bar graph shows the data from the experiment, including error bars showing ± 2 standard deviations (a measure of variation for a group of data as a whole). Based on the data provided, do you reject or fail to reject the null hypothesis? Select the answer that most strongly supports your choice and correctly justifies the response. Based on the data provided, do you reject or fail to reject the null hypothesis? Select the answer that most strongly supports your choice and correctly justifies the response. A. Reject the null hypothesis, as variation, shown by the error bars, is greater after selection. B. Reject the null hypothesis, as there is no overlap between the means as shown by the error bars. C. Reject the null hypothesis, as the error bars for the two groups show…
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