Answer:
d.
Step-by-step explanation:
Hello!
The objective of this test is to know if aerobic exercise modifies hippocampus activity. A random sample of 120 elderly men and women was taken and divided into two groups.
Group 1: Walked around a track three times a week.
Group 2: Did a variety of less aerobic exercises, including yoga and resistance training with bands.
After a year their brains were scanned showing that group 1 had an increase of 2% in their hippocampus and group 2 showed a decrease of 1.4%
a. True, this type of observational study can be the prelude to a more formal statistical study.
b. True, the explanatory variable is "type of exercise", it's the variable that the investigator suspects influence the hippocampus volume.
c. True, the objective of this experiment is to test if there is any modification on hippocampus volume, that's why the volume of the hippocampus was measured, before and after a year of exercise.
d. False, this is an observational study, you cannot establish a causal relationship between the two variables. Just inform you that there seems to be an association. To be able to generalize the results to all elderly population you need a more formal statistical experiment to support your conclusions.
I hope it helps!
Ultimately Woodrow Wilson's preferred direction was not to get involved
with the internal affairs of the USA's near neighbors in Latin America.
However events unfolded that meant his governments ended up being as
interventionist as those of Teddy Roosevelt, for example occupying Haiti
and the Dominican Republic. These activities were not intended plans of
Wilson's in the way that Roosevelt set out to police Latin America but
nonetheless the impact was the same.
<span />
Answer:
TheaterMania, basically you are getting more popcorn for $1, thats how did it.
- Calculating the area of a soccer field, Calculate area of _______
- Calculate the average height of everyone in your family
