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Which us president proposed a decimal based measurement system for the us

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.

The “redeemers” in the last-19th century south would have been most likely to support?