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.
The Aztec civilization developed in Mesoamerica beginning in the 1200s. They created a 365-day agricultural calendar and used a sacred calendar as well. They created a writing system that was based on symbols and glyphs. There are Aztec books that remain and that share the rich depictions of Aztec legends. These books also detail the beliefs of the Aztec people and their daily lifestyle.
The Mayan people built their greatest cities between A.D. 250 and A.D. 900. They used two calendars with one being based on a solar year and one on a sacred almanac. The Maya also developed a three-symbol numerical system for recording numbers into the millions.
Both civilizations are praised because of their complexity in a time when many civilizations were very primitive. Along with the Inca civilization, these two are considered the "great civilizations." The Inca civilization is not mentioned in detail here because the civilization failed to come up with a writing system for recording information.
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Answer:
After Britain won the Seven Years' War and gained land in North America, it issued the Royal Proclamation of 1763, which prohibited American colonists from settling west of Appalachia. The Treaty of Paris, which marked the end of the French and Indian War, granted Britain a great deal of valuable North American land.
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Answer:
Brown vs Bourd of Education court case
