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Alex_Xolod [135]
2 years ago
10

a researcher is studying the effects of playing chess on memory improvement. he identifies 50 people who play chess and 50 peopl

e who do not. each of the 100 people is given a questionnaire designed to determine memory level. none of the 100 people who participated in the study knew they were part of a study. which statement is true.
Mathematics
1 answer:
Sever21 [200]2 years ago
6 0

Answer:

Observational study

Step-by-step explanation:

Just took the test

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