The biggest problem with the equivalent time-sample ...

[Starlight]

The biggest problem with the equivalent time-sample quasi-experimental design is the possibility of the _______________ effect.
 a. interactive testing c. statistical regression
  b. history d. instrumentation

Question 2

Which of the following is a measure of the central tendency of a set of scores?
 a. mode
  b. median
  c. mean
  d. all of these choices

[karmakat49]

Answer to Question 1

A
Because treatments and measurements are repeated, there can be some learning from one period to another.

Answer to Question 2

D

[Starlight]

TYSM

[vickyvicksss]

Thanks for the timely response, appreciate it