10. The level of significance indicates the... A. Proportion of probable outcome

Question

10. The level of significance indicates the... A. Proportion of probable outcomes. B. Importance of the statistical analysis C. Probability that a correct decision has been made. D. Degree of rarity required to neject the null hypothesis. 11. Given the critical z values of +/-1.96 and an observed z value of 2.40, the appropriate decision is to... A. Retain the null hypothesis. B. Reject the null hypothesis C. Neither retain nor reject, but increase the size of the sample. D. Neither retain nor reject, but conduct another investigation. 12. A university president believes that, over the past few years, the average age of students attending her university has changed. To test this hypothesis, an study is conducted in which the age of 150 students who have been randomly sampled from the student body is measured. The mean age is 23.50 years. A complete census taken at the university a few years before the experiment showed a mean age of 22.40 years with a standard deviation of 7.60. A. What is the null hypothesis? B. What is the alternative hypothesis? C. Specify the decision rule using the 05 level of significance

Explanation / Answer

10. Please post 1 question per post, as per forum rules. Here' the answer to Q10:

THe level of significance indicates the..

D. the degree of rarity required to reject the null hypothesis

In other words, the alpha defines a probability cutoff, below which we consider the event to be rare enough
to rejected the null hypothesis

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