In addition to measuring the Body Concern of the participants who joined a fraternity/sorority both immediately before and immediately after they join, Dr. Fletcher measures them for the 3 weeks before and the 3 weeks after. This type of design is known as a(n)

Interrupted time-series design

Explanation:

In scientific studies, this design is known as an Interrupted time-series design. Basically, it is when a researcher analyses a long-term period before and after an interruption for whatever reason in order to determine the extent to which the interruption/intervention affected the results of the study. In this experiment, Dr.Fletcher is examining the results between a span of 6 weeks from the point of joining the fraternity/sorority.

answer; /// i believe that the correct answer is (a) making presentations;

a. formula: f=ma or f/m=a

10,000n/1,267kg≈7.9m/

b. formula: a= and s=d/t

speed= 394.6/15

s=26.3m/s

a=

a=1.75m/

c. 7.9-1.75=difference of 6.15m/

d. the force that most likely caused this difference is friction forces