Sagot :
Answer:
1. History: events affecting subjects and data collected.
2. Maturation of subjects: wiser, tired, older; influencing responses.
3. Testing: learn from being in study.
4. Instruments' accuracy: standardized procedure.
5. Subject selection: nonrandom and potentially biased.
Answer:
- history events affecting subject and data
Collection.
- Maturation of subject: wiser, tired, older ; influencing responses.
-Testing: learn from being in study.
- Instruments' accuracy:standardized procedure.
- Subject selection: nonrandom and potentially
Biased.
Explanation:
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