A key hospital outcome measure of clinical performance is length of stay (LOS), that is, the number of days a patient is hospitalized. For patients at one hospital with acute myocardial infarction (heart attack), the length of stay over the past four years has consistently decreased. The hospital also has data for various treatment options such as the percentage of patients who received aspirin upon arrival and cardiac medication for Left Ventricular Systolic Dysfunction (LVSD). The data are as follows:

Year Average LOS Aspirin on arrival LVSD medication
2007 4.22 days 95% 91%
2008 4.10 days 98% 95%
2009 4.17 days 99% 96%
2010 4.23 days 100% 98%
Calculate descriptive statistics for the data. Do not round intermediate calculations. Round your answers to four decimal places, when needed.

Descriptive Statistics: LOS, Aspirin, LVSD
Standard Standard
Variable Mean Error Deviation Minimum Median Maximum
LOS (days)
Aspirin (%)
LVSD (%)
Calculate correlations for the data. Do not round intermediate calculations. Use a minus sign for negative values, if any. Round your answers to three decimal places.

Correlations: LOS, Aspirin, LVSD
LOS Aspirin
Aspirin
LVSD
Choose the correct graph showing the LOS as a function of the Aspirin on arrival.

The correct graph is
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B.
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Choose the correct graph showing the LOS as a function of the LVSD.

The correct graph is
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.

A.
B.
C.
D.