**PART 1 **

Different type of studies - retrospective observational, prospective observational and experiments.

Find a website that gives results of one of these types of studies. Please answer the following items:

1. identify the website

2. what type of study: retrospective observational, prospective observational or experiments

3. what is the outcome of the study? summarize in one or two sentences only.

Here is an example:

1. URL: http://www.epi.bris.ac.uk/bwhhs/

2. prospective observational cohort study of heart disease in British women between the ages of 60 and 79.

3. It appears that the study may still be ongoing but there are several links to newsletters and publications.

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PART 2Researchers were interested in determining if individuals who worked nights were more likely to use sick time. The researchers compared the work histories of 230 individuals who worked the night shift with 255 individuals who worked the day shift. The sample came from work histories of employees at BetterBread Bakery.A)What is the response variable?

B)

C)Researchers were interested in determining if individuals who worked nights were more likely to use sick time. The researchers compared the work histories of 230 individuals who worked the night shift with 255 individuals who worked the day shift. The sample came from work histories of employees at BetterBread Bakery.A)The study showed that individuals who worked nights were 23% more likely to use sick time. According to DeVeaux and Velleman, does this study present convincing evidence that individuals who worked nights are more likely to use sick time?

B)

C)A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the students had experienced the same mathematical approaches, they demonstrated the same levels of mathematics achievement, and there were no differences in gender, ethnicity, or social class.A)

In one class, teachers taught mathematics through lectures and textbooks. This was thetraditionalgroup. Discipline standards were very high, and the students were tested often. In the second class, students worked on open-ended projects, and teachers used a variety of methods for teaching. Discipline was extremely relaxed for this group. This was thenon-traditionalgroup. At the end of the project, students were tested on Britain's National School-Leaving Exam. The mean for the traditional group was 473 while the mean for the non-traditional class was 582.

Identify the type of study.

B)

C)A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the students had experienced the same mathematical approaches, they demonstrated the same levels of mathematics achievement, and there were no differences in gender, ethnicity, or social class.A)

In one class, teachers taught mathematics through lectures and textbooks. This was thetraditionalgroup. Discipline standards were very high, and the students were tested often. In the second class, students worked on open-ended projects, and teachers used a variety of methods for teaching. Discipline was extremely relaxed for this group. This was thenon-traditionalgroup. At the end of the project, students were tested on Britain's National School-Leaving Exam. The mean for the traditional group was 473 while the mean for the non-traditional class was 582.

Identify the subjects in this study. Could theresultsof this study beappliedto students in Pinellas County?

B)

C)

D)A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the students had experienced the same mathematical approaches, they demonstrated the same levels of mathematics achievement, and there were no differences in gender, ethnicity, or social class.A)

In one class, teachers taught mathematics through lectures and textbooks. This was thetraditionalgroup. Discipline standards were very high, and the students were tested often. In the second class, students worked on open-ended projects, and teachers used a variety of methods for teaching. Discipline was extremely relaxed for this group. This was thenon-traditionalgroup. At the end of the project, students were tested on Britain's National School-Leaving Exam. The mean for the traditional group was 473 while the mean for the non-traditional class was 582.I. The two groups had no differences in gender, ethnicity, or social class.

II. The study used a sample of 248 students.

III. The students were randomly selected.

IV. The students were all tested on Britain's National School-Leaving exam.

V. The students had all experienced the same mathematical approaches and demonstrated the same mathematics achievement before the study began.

VI. The students were randomly assigned to the groups.

Explain how the researchers employed the principle ofcontrolin the design of the study.Select all that apply.Note: This question is not about the control group.

B)

C)

D)

E)A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the students had experienced the same mathematical approaches, they demonstrated the same levels of mathematics achievement, and there were no differences in gender, ethnicity, or social class.A)

In one class, teachers taught mathematics through lectures and textbooks. This was thetraditionalgroup. Discipline standards were very high, and the students were tested often. In the second class, students worked on open-ended projects, and teachers used a variety of methods for teaching. Discipline was extremely relaxed for this group. This was thenon-traditionalgroup. At the end of the project, students were tested on Britain's National School-Leaving Exam. The mean for the traditional group was 473 while the mean for the non-traditional class was 582.I. The two groups had no differences in gender, ethnicity, or social class.

II. The study used a sample of 248 students.

III. The students were randomly selected.

IV. The students were all tested on Britain's National School-Leaving exam.

V. The students had all experienced the same mathematical approaches and demonstrated the same mathematics achievement before the study began.

VI. The students were randomly assigned to the groups.

Explain how the researchers employed the principle ofreplicationin the design of the study.Select all that apply.

B)

C)

D)A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the students had experienced the same mathematical approaches, they demonstrated the same levels of mathematics achievement, and there were no differences in gender, ethnicity, or social class.A)

In one class, teachers taught mathematics through lectures and textbooks. This was thetraditionalgroup. Discipline standards were very high, and the students were tested often. In the second class, students worked on open-ended projects, and teachers used a variety of methods for teaching. Discipline was extremely relaxed for this group. This was thenon-traditionalgroup. At the end of the project, students were tested on Britain's National School-Leaving Exam. The mean for the traditional group was 473 while the mean for the non-traditional class was 582.I. The two groups had no differences in gender, ethnicity, or social class.

II. The study used a sample of 248 students.

III. The students were randomly selected.

IV. The students were all tested on Britain's National School-Leaving exam.

V. The students had all experienced the same mathematical approaches and demonstrated the same mathematics achievement before the study began.

VI. The students were randomly assigned to the groups.

Explain how the researchers employed the principle ofrandomizationin the design of the study.Select all that apply.

B)

C)

D)A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the students had experienced the same mathematical approaches, they demonstrated the same levels of mathematics achievement, and there were no differences in gender, ethnicity, or social class.A)

In one class, teachers taught mathematics through lectures and textbooks. This was thetraditionalgroup. Discipline standards were very high, and the students were tested often. In the second class, students worked on open-ended projects, and teachers used a variety of methods for teaching. Discipline was extremely relaxed for this group. This was thenon-traditionalgroup. At the end of the project, students were tested on Britain's National School-Leaving Exam. The mean for the traditional group was 473 while the mean for the non-traditional class was 582.

Identify the number of treatment levels and the types of treatments in this study.

B)

C)

D)A newspaper article reported on the results of a new study on the effectiveness of calcium supplements. Sixty-two subjects participated in the study, and these subjects were randomly assigned to one of two groups. One group received a new type of calcium supplement while the other group received a placebo which looked identical to the calcium supplement. The doctors administering the study provided the medicines to the subjects, but they themselves did not know if the subjects were receiving the calcium or the placebo. Preliminary results indicate that there is improvement in bone density with the new calcium supplement. Why is this a double-blind experiment?A)

B)

C)

D)A newspaper article reported on the results of a new study on the effectiveness of calcium supplements. Sixty-two subjects participated in the study, and these subjects were randomly assigned to one of two groups. One group received a new type of calcium supplement while the other group received a placebo which looked identical to the calcium supplement. The doctors administering the study provided the medicines to the subjects, but they themselves did not know if the subjects were receiving the calcium or the placebo. Preliminary results indicate that there is improvement in bone density with the new calcium supplement. What term do we apply to the group that received the placebo?A)

B)

C)

Subject | Mathematics |

Due By (Pacific Time) | 09/27/2013 11:00 pm |

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