A researcher tests a new mathematics program in one school district and uses a neighboring district as a no-treatment control group. After running the program for six months, the researcher tests the students from both school districts to see if there is a difference. This research cannot be classified as a true experiment because
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there is no pretest to determine math ability before the program. |
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the researcher had no control over assignment to groups. |
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the study was not conducted in a laboratory. |
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the treatment is administered to only one group. |
The correct answer is Option B. This cannot be classified as a true experiment because the researcher had no control over assignment to groups.
A researcher tests a new mathematics program in one school district and uses a neighboring district...
A researcher is interested in determining if a new intensive treatment program for high school students with alcohol abuse problems is effective. In order to recruit participants for this study, flyers are mailed to all families of high school students in the Northwest Arkansas area. Ninety-three families decide to participate in the study. To test the main research hypothesis, the families are randomly assigned to one of three groups, with the restriction that an equal number of families are in...
A researcher is interested in determining if a new intensive treatment program for high school students with alcohol abuse problems is effective. In order to recruit participants for this study, flyers are mailed to all families of high school students in the Northwest Arkansas area. Ninetythree families decide to participate in the study. To test the main research hypothesis, the families are randomly assigned to one of three groups, with the restriction that an equal number of families are in...
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Perform a one-tailed test. Set up H0 and Ha. Compute test statistic and p-value. Draw conclusions. For both questions. #1. A Gallup survey conducted April 2–11, 2018, found that 152 out of 1015 American adults mentioned immigration/illegal aliens as the most important problem facing the nation. An earlier survey conducted in February 2011 found that 108 out of 978 American adults mentioned immigration/illegal aliens as the most important problem facing the nation. Can we conclude that the percentage of all...
Perform a one-tailed test. Set up HO and Ha. Compute test statistic and p-value. Draw conclusions. #1. A Gallup survey conducted April 2–11, 2018, found that 152 out of 1015 American adults mentioned immigration/illegal aliens as the most important problem facing the nation. An earlier survey conducted in February 2011 found that 108 out of 978 American adults mentioned immigration/illegal aliens as the most important problem facing the nation. Can we conclude that the percentage of all American adults who...
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