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9. a. What is a Type II error? b. Which factors affect the probability of making a Type II error? c. How can a researcher

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9. a. What is a Type II error? b. Which factors affect the probability of making a Type II error? c. How can a researcher decrease the possibility of making a Type II error? d. What is statistical power? Which factors affect it? 10. a. What determines the width of a confidence interval? List all the factors. b. How can a researcher make a confidence interval narrower? 11. What is the relationship between a 95% confidence interval and a nondirectional hypothesis test with a=0.05

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