# HLT 362 Exercise 18

Explain when a z-test would be appropriate over a t-test.

DQ2 Week 3

Researchers routinely choose an alpha level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower alpha level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?

EXERCISE 20 Questions to be Graded

1.Which patient scored the highest on the preoperative CVLT Acquisition? What was his or her T score? 2.Which patient scored the lowest on postoperative CVLT Retrieval? What was this patient's T score? 3.Did the patient in Question 2 have more of a memory performance decline than average on the CVLT Retrieval? Provide a rationale for your answer. 4.What is the mean () and standard deviation (SD) for preoperative T score for CVLT Acquisition? 5.Is the preoperative Retrieval T score for Patient 5 above or below the mean for the norm of the group? Provide a rationale for your answer. 6.Assuming that the distribution of the preoperative CVLT Retrieval T scores is normal, the middle 68% of the patients had T scores between what two values? 7.Assuming that the distribution of scores for the postoperative CVLT Retrieval T scores is normal, the middle 68% of the patients had T scores between what two values? 8.The researchers state that it appears that the functional integrity of the left temporal lobe, despite evidence of structural abnormality, plays a considerable role when it comes to memory outcomes following left ATL. Can the findings from this study be generalized to a larger population? Provide a rationale for your answer. 9.If a patient had a raw score = 30, what would his/her postoperative CVLT Retrieval T score be? 10.Did patients demonstrate more postoperative memory declines among CVLT Retrieval T scores than CVLT Acquisition T scores? Provide a rationale for your answer. (Grove 149)

Grove, Susan K. Statistics for Health Care Research: A Practical Workbook. W.B....

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