Pain levels of ICU patients. Refer to the Research in

QUESTION:

Problem 29E

Pain levels of ICU patients. Refer to the Research in Nursing & Health (Vol. 35, 2012) study of the effectiveness of a pain intervention, Exercise 13.13 (p. 13-30). Recall that pain levels (measured on a 100-point scale) were recorded for a sample of 10 ICU patients 24 hours post surgery each week for 20 consecutive weeks. The data are repeated in the accompanying table. Now, you want to check process variation using an R-chart a. Compute the centerline for the chart. b. Compute the UCL and LCL for the R-chart. c. Plot the ranges for the 20 weeks on the R-chart. Does the variation of the pain management process appear to be “in control”? d. Recall that after the 20th week, a pain intervention occurred in the ICU. The ranges of the pain levels for the samples of patients over the next 8 consecutive weeks were (in order): 22, 29, 16, 15, 23, 19, 30, and 32. Plot these ranges on the R-chart. e. Apply pattern-analysis rules to the extended R-chart, part d. What do you observe?

Source: Based on “Statistical Process Control in Nursing Research” by Denise F. Polit and Wendy Chaboyer from RESEARCH IN NURSING AND HEALTH, February 2012, Volume 35(1).