Answer: Wendy did not use random assignment
Explanation: Wendy's failure to randomly assign participants or subject to his research will pose a threat to the internal validity of his study. The internal validity of a study simply refers to the structure of an experiment and it's trustworthiness in establishing causal relationship between the applied treatment used a study and the observed outcome. Wendy's decision to ignore random assignment and opt for a manual assignment of subject to each treatment will pose a threat to the structure of his study and hence the establishment of a causal relationship between the treatment t and outcome of the study.
What has been changed by humans or influenced.
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Answer:Wall Street refers to all the banks, hedge funds, and securities traders that drive the American financial system. Geographically, Wall Street is the center of Manhattan's financial district. It runs east/west for eight blocks from Broadway to South Street.