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A hospital is interested in improving its processes as it is losing money on bowel surgery patients reimbursed through Medicare. A stratification approach was employed to achieve "risk adjustment" and the quality improveme nt team analyzed data on patients undergoing elective surgery, who were 65 years of age or older, and were having a single procedure. The selected measure is the post-operative length of stay (LOS). The table below shows LOS for a randomly selected patient each month for 30 months. A new pathway was introduced after the 18th month.
Month
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
LOS
19
16
17
18
20
21
22
23
24
25
26
27
28
29
30
a. Construct appropriate control charts for before and after introduction of the new pathway. Discuss process stability and the results.
b. Can you conclude that the new pathway has caused a significant reduction in the average length of stay? Test using α = 0.05.
What is the probability you pick a plum and Which of the following is a legitimate probability distribution for this situation
Compute lower and upper quartiles of log10-balances? Determine 95% range of the balances in $s? Express in English what the two boundaries mean.
Perform hypothesis testing on one variable's data.
Decide if the events A and B are mutually exclusive or not mutually exclusive. A card is drawn from standard deck of 52 playing cards.
Using six-step critical value approach, at the 0.05 level of significance, is there evidence that population mean delivery time has been increased below previous population mean value of 25 minutes?
Suppose we wish to predict the crawling age of a particular baby when the average outdoor temperature is 25°F six months after birth.
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
A chance sample of 50 families revealed an average or median of $112,000 and a standard deviation of $40,000. What is the standard error of the average or median?
The hypothesis that the samples came from identical populations cannot be rejected, the T value is 16.5 greater that the lower limit.
CASE STUDY: Are the Fish Safe to Eat? Assessing which Factors affect Mercury Levels in Fish in Maine Lakes.
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
Investigate the cost of a home mortgage and to determine the monthly payment.
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