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# 1. What are null hypothesis and alternative hypothesis? 2. Inastatisticaltest,wehavethechoiceofatwo-tailedtest,aleft- tailed test, or a right-tailed test. Which hypothesis is the determining factor fo...

1. What are null hypothesis and alternative hypothesis?

2. Inastatisticaltest,wehavethechoiceofatwo-tailedtest,aleft- tailed test, or a right-tailed test. Which hypothesis is the determining factor for choosing the direction of the test? (In other words, how would you decide it)

3. Forthesamesampledataandnullhypothesis,howdoesthe P-value for a two-tailed test compare to that for a one-tailed test?

4. Using P-value method, how would you reject or fail to reject the null hypothesis? (what is the decision criteria?) How does level of significance matter to the hypothesis testing?

5. If the P-value is such that you can reject Ho at the 5% level of significance, can you always reject Ho at the 1% level? Explain.

6. What do we mean when we say the data used in a statistical test are significant?

7. In class we mentioned: “If you are conducting a study and want to use a hypothesis test to support your claim, the claim must be worded so that it becomes the alternative hypothesis”. Please Explain.

8. In hypothesis testing, why it is more appropriate to use “Fail to reject to H0” instead of “Accept H0”?

9. What is test statistics? Calculating a test statistics will vary, please list one example here.

10.Explain the type I and type II error.

11. Describe the general steps to use traditional Critical Region methods.

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