Distinguish between reliability and validity

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Distinguish between reliability and validity. Is it more important in psychological testing to have a test with high reliability, or one with high validity? Why? 200 words, apa format, 2 peer-review journal articles, reference 

What are the most important considerations when interpreting achievement test scores? Why? What are the most important considerations when making decisions based on achievement test scores? Why. 200 words, apa format, 2 peer-review journal articles, reference