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Hermione and Luna conducted a study on the effects of marijuana on academic performance, and the effect of school on marijuana usage. They recruited 50 people from a well-known group of marijuana users at school, and 50 people from a well-known group of abstainers. At the beginning of the school year, they administered three measurements […]
1. What features distinguish proportionate stratified samples from disproportionate stratified samples? In which research contexts might one be preferred to the other? 2. If we want to conduct a representative national survey with approximately 2,000 respondents, with the goal of obtaining a relatively accurate idea of people’s opinions regarding an important national issue, why might […]
1. Explain the relationships among true score, observed score, and random error. 2. What are the two main assumptions that need to be satisfied when conducting an item response analysis? 3. In terms of reliability, describe how analyses with latent factors are different from classical test theory techniques like Cronbach’s alpha or test-retest. Are they […]
Case study 3 Alaska Supply Chain Integrators’ cost of goods Alaska Supply Chain Integrators (ASCI) purchases goods for oil companies working on the North Slope of Alaska. The North Slope is the oil production field where crude oil is extracted and then transported to the shipping terminals in Valdez, AK. From Valdez, the oil is […]
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