# statistics

## statistics

﻿EXERCISE 20 QUESTIONS By Anit Alexkutty
1.Which patient scored the highest on the preoperative CVLT Acquisition? What was his or her T score?
Answer: Patient 3 scored the highest on the preoperative CVLT acquisition with a T score of 63
2.Which patient scored the lowest on postoperative CVLT Retrieval? What was this patient’s T score?
Answer: Patient 4 scored the lowest on postoperative CVLT Retrieval with a T score of 23
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.
Answer: Yes, the average memory performance decline on the CVLT Retrieval was around 9 points while the memory performance decline on the CVLT Retrieval test for patient 4 was about 21. Thus, patient 4 almost doubled the memory performance decline than average on the CVLT Retrieval test.
Work: Average mean difference in memory performance decline on CVLT Retrieval: 47.8 – 38.2 = 9.6 points. (Data from Table 3)
Difference in memory performance decline on CVLT Retrieval for Patient 4: 44 – 23 = 21 points. (Data from Table 2)
4. What is the mean ( X–) and standard deviation (SD) for preoperative T score for CVLT Acquisition?
Answer: For preoperative Acquisition, the mean (X) = 45.9 and the standard deviation (SD) = 5.2. (Data from Table 3)
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.
Answer: The preoperative Retrieval T score for Patient 5 is above the mean for the norm of the group. The preoperative Retrieval T score for patient 5 is 52 while the mean for the norm of the group is only 47.8 with a SD of 5.8. So, patient 5 is a little less than 1 standard deviation greater than the mean preoperative Retrieval T score for the norm of the group. (Data from Table 2 & 3)
Work: 47.8 + 5.8 = 53.6 > 52.
6. Assuming that the distribution of the preoperative CVLT Retrieval T scores is normal, the...