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1. Can research be done without formulating a hypothesis? Wh. 1. Can research be done without formulating a hypothesis? What is the importance of the null hypothesis?2. When is a hypothesis rejected? When it isn t rejected? What are its limitations?3. What is the difference between level of significance and level of confidence? How are the two related to type I and type II errors used in hypothesis testing? Explain using a specific example.4. What is z-test? What is t-test? When should we use t-test, not z-test for population means? Would the results be significantly different?5. Explain the difference between a left-tailed, right-tailed and two-tailed test. Give you own examples. 6. When would you choose a two-tailed test? How might you tell the direction of the test by looking at a pair of hypothesis? How might you tell which direction (or no direction) to make the hypothesis by looking at the problem statement (research question)?7. What is the differences between a dependent (paired) test and an independent two- samples independent test? What are the requirements needed for each test. Provide examples. 8. Under what circumstances must a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests? Can the outcomes of nonparametric tests be generalized to populations? 1. Can research be done without formulating a hypothesis? Wh
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