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Black Death was an epidemic of bubonic plague, a disease caused by the bacterium Yersinia pestis that circulates among wild rodents where they live in great numbers and density. Plague among humans arises when rodents in human habitats, normally black rats, become infected.
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to sell their product fast and to earn lots of money
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B. Matched groups design
Explanation:
In matched group design, subjects are matched on specific variables such as reading readiness score in this case which may affect the outcome of the dependent variables such as effectiveness of computer-assisted instruction in reading and then the subjects are split into the test groups. This is just to reduce errors in the study.
Answer:
When researching how to do things, online search results bring up sources such as (Red play button logo video player) and wiki. I find red to be most helpful and credible as it visually explains the steps with demonstration as well as talking the viewer through it. Wiki mostly provides just photos of the steps and words rather than all that red brings. Red's credibility comes from the fact that its videos show the situation in action and functioning.