4. Chapter 20: Exercise 86 on page 584 (8 marks) 5. Chapter 21: Exercise 30 on p

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4. Chapter 20: Exercise 86 on page 584 (8 marks) 5. Chapter 21: Exercise 30 on page 606 (10 marks) 6. Chapter 21: (12 marks) l Analog Scale (VAS) is a graphic rating tool used to gauge relative ty of subjective measures such as feelings, attitudes, or opinions. A VAS consists of a horizontal line which represents a continuous scale, typically from a zero value a which Never', 'Seldom', 'Sometim on the line representing the l VAS shown below has been used to self-report pain intensity t left to a maximum value at right. The line is marked at intervals, may or may not be assigned numerical values or descriptors such as etc. Testers or subjects place an 'x or other mark ocation of their perceived rating or self-rating. The For example, the pain intensity for the subject response below has a VAS value of 30. Worst No Pain Pain In an acupuncture study 12 patients were randomly assigned to the acupuncture treatment and 8 to the placebo. The visual analog scale (VAS) was used to measure pain intensity before and after treatment for each patient in each treatment group. The tables on the next page give the results of this simulated study

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