In a previous practice assignment, you learned about a study in which volunteers (who were all around 30 years of age) from the Chicago area wore light sensors to measure their exposure to sunshine It was found that those who experienced more daylight had lower body mass indexes (BMIs) The study was observational It was not an experiment, so conclusions about cause and effect could not be made Let's redesign the observational study described above into an experimental study Part A What is the explanatory variable for the new study Age Body mass index Sunshine exposure Part B What is the response variable in the new study Sunshine exposure Body mass index Age Part C In experiments, we divide people into groups and apply treatments to each group How should we create these groups in the new study By grouping people according to their BMIs By randomly assigning people to groups By grouping people by how much time they spend in the daylight Part D As we apply treatments to the groups, we manipulate the explanatory variable How should this be done in the new study By giving each member a light sensor and observing how much time each group spends in the daylight each day By assigning to each group a specific number of hours each day that they are to spend in the daylight By assigning the groups with higher average BMIs more time in the daylight so that we can see if they lose weight Part E After a period of time, suppose that there is no difference in the average BMI from group to group What would be the best conclusion There is no evidence that increased sun exposure contributes to lower BMI There is evidence that increased sun exposure contributes to lower BMI There is evidence of an association between amount of sun exposure and BMI Part F After a period of time, suppose that groups who received the most sunlight had the lowest average BMIs What would be the best conclusion There is evidence of an association between amount of sun exposure and BMI There is evidence that increased sun exposure contributes to lower BMI There is no evidence that increased sun exposure contributes to lower BMI

Question

In a previous practice assignment, you learned about a study in which volunteers (who were all around 30 years of age) from the Chicago area wore light sensors to measure their exposure to sunshine  It was found that those who experienced more daylight had lower body mass indexes (BMIs)  The study was observational  It was not an experiment, so conclusions about cause and effect could not be made  Let's redesign the observational study described above into an experimental study  Part A  What is the explanatory variable for the new study  Age Body mass index Sunshine exposure Part B  What is the response variable in the new study  Sunshine exposure Body mass index Age Part C  In experiments, we divide people into groups and apply treatments to each group  How should we create these groups in the new study  By grouping people according to their BMIs By randomly assigning people to groups By grouping people by how much time they spend in the daylight Part D  As we apply treatments to the groups, we manipulate the explanatory variable  How should this be done in the new study  By giving each member a light sensor and observing how much time each group spends in the daylight each day By assigning to each group a specific number of hours each day that they are to spend in the daylight By assigning the groups with higher average BMIs more time in the daylight so that we can see if they lose weight Part E  After a period of time, suppose that there is no difference in the average BMI from group to group  What would be the best conclusion  There is no evidence that increased sun exposure contributes to lower BMI  There is evidence that increased sun exposure contributes to lower BMI  There is evidence of an association between amount of sun exposure and BMI  Part F  After a period of time, suppose that groups who received the most sunlight had the lowest average BMIs  What would be the best conclusion  There is evidence of an association between amount of sun exposure and BMI  There is evidence that increased sun exposure contributes to lower BMI  There is no evidence that increased sun exposure contributes to lower BMI

SolutionInn · Accepted Answer

The Answer is in the image, click to view ...

Question: In a previous practice assignment, you learned about a study in which volunteers (who were all around 30 years of age) from the Chicago area

Step by Step Solution