For this pause-problem, consider the following study: a researcher would like to conduct an experiment to test the effectiveness of a program designed to raise sat scores. he wishes to obtain a sample of low-scoring high school students, administer the program, and then administer the sat again. he hypothesizes that sat scores will be higher after the program than before. pick out three potential validity threats to this study (internal or external) and describe what the researcher can do to limit each of those three threats

What is the connection between alexander and greek words in the words in the kalish language today

How does the establishment clause limit government?

Danilo has been working for metropolitan taxi for three months. he expected that his job would be to drive around the city, pick up fares, and drop them off at their desired locations, but in his first few days on the job he realized that the job entails much more. he must keep his taxi cab clean and neat, and some days he will be stationed at the shop and go to people's houses to pick them up and bring them to the local airport. within a few months, he has learned that taxi drivers often express frustration with the people they call "civilians"—that is, non–taxi drivers, whose driving skills they complain about incessantly. in his first few months on the job, describes what danilo is undergoing.