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What is the relationship between reliability and validity

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Reference no: EM131513183

Please answer these questions.

  1. What is the relationship between reliability and validity? How can a test be reliable but not valid? Can a test be valid but not reliable? Why or why not?
  2. How does understanding probability help you understand statistics?
  3. How could you use standard scores and the standard distribution to compare the reading scores of two students receiving special reading resource help and one student in a standard classroom who does not get special help?
  4. In a standard normal distribution: What does a z score of 1 represent? What percent of cases fall between the mean and one standard deviation above the mean? What percent fall between the mean and -1 to +1 standard deviations from the mean? What percent of scores will fall between -3 and +3 standard deviations under the normal curve?

Reference no: EM131513183

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