Consider the control chart in Exercise 12.5, part ( b) :
a. Perform a median run test and an up/down run test, using 95.5 percent confidence intervals.
b. Are the response patterns to patient calls random?
Exercise :
Complaints of late responses to patient calls in a nursing unit trigger a study by the decision support department, requested by the nursing manager. A time study team made observations and compiled the data in Table EX 12.5.
The measurements are recorded in minutes (rounded to the nearest minute) of response time once the patient has pressed the call button.
a. Using the standard deviation approach, construct 99.7 percent confidence limits for patient call response times.
b. Develop an appropriate control chart for the days.
c. Are there any days in violation of the confidence limits?