Exercise A.32 on page 149 introduces a study investigating the effectiveness of behavioral changes and prescription medication in helping older people find improvement in fighting insomnia. The results are summarized inTable C.10.

(a) Some of the counts in the cells are very small, definitely too small to use a normal based test. When this is the case, we often collapse some of the cells together. Combine cells from Table C.10 to fill in the cells in Table C.11 with appropriate values.
(b) Although, when completed, one of the cells in Table C.11 has only a count of 9, this is close to 10 and is only one cell, so we proceed with a normal-based test. Test to see if training helps people improve in the fight against insomnia.

Table C.11

Exercise A.32 on page 149 

Studies have shown that behavioral changes and prescription medication can help older people fight insomnia. Researchers followed the sleep patterns of 72 people whose average age was 65. Seventeen people took a medication called temazepam an hour before bedtime, 18 people received training in techniques to improve sleep, 19 did both, and 18 took a placebo and received no training. The results are summarized in Table A.6. Find the following proportions for this sample.

Table A.6

Transcribed Image Text:

Improvement| Medication Training Both Neither|Total Much 22 10 Some 4 5 16 17 18 None 34 Total 17 18 19 72 Any Improvement Yes Training No Training Total No Total