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naeemi naeemi
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7 years ago
The classical experimental design
a.   helps guard against the sources of internal and external validity.
b.   helps guard against the sources of external invalidity.
c.   helps guard against the sources of internal invalidity.
d.   cannot guard against the sources of either internal or external invalidity.
e.   what it helps guard against depends upon the particular experiment.
Textbook 
The Practice of Social Research

The Practice of Social Research


Edition: 13th
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clintreclintre
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#1
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7 years ago
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naeemi Author
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7 years ago
Thanks
derya1234
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Yesterday
Thank you, thank you, thank you!
fxinternational
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2 hours ago
Good timing, thanks!
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