Author Question: When using the subtractive method, experimental manipulations are used to a. alter the quality of ... (Read 91 times)

DelorasTo · **on:** Jun 19, 2018

When using the subtractive method, experimental manipulations are used to

a. alter the quality of stages involved in a task.
b. alter the duration of stages.
c. alter the error rates.
d. add or delete stages.

Question 2

Last year, the state increased the speed limit on one section of highway from 55 to 65 mph. To evaluate the effect of the change, a researcher gathered accident reports for six months before the change and for six months after the change. This is an example of a(n) ____.

a. time-series design
b. interrupted time-series design
c. cross-sectional design
d. longitudinal design