Explore BrainMass

data collection threats

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

Name two weaknesses of the following design (i.e, threats to either internal or external validity). Describe how the weaknesses could be overcome.

A. O1 X O2 Two group Pretest- Posttest
O1 -- O2

Note: O = Pretest Observations
O2 = Posttest Observations
X= Treatment
(R) = Random Selection & Assignment to Groups

© BrainMass Inc. brainmass.com October 24, 2018, 6:52 pm ad1c9bdddf

Solution Preview

First problem is that the test units are not randomly assigned. See there is no (R) symbol in the symbolic representation of the experiment. Because no random assignment is made the two groups may differ before the treatment and ...

Solution Summary

Data collection threats are discussed in the solution.

See Also This Related BrainMass Solution

Trained Data Collectors

What effect does improperly trained data collectors have on the data collection process? How do they affect the evaluation outcome? How can the evaluator overcome this threat to the data collection process?

Please include a reference so that I can expand on this topic

View Full Posting Details