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The chi–square test can be used:
1) To evaluate the effect of a variable on outcomes
2) To analyze continuous data
3) To calculate an odds ratio or relative risk
4) If each cell of the table is greater than 5
The measure of central tendency most affected by outliers is:
The p value in statistical test results indicates:
On a normally distributed data set, what percentage of values lie within three standard deviations from the mean?
Which statistical test is used when the data are small in numbers?
Statistical process control (SPC) charts are used for all of the following purposes except:
Seventy-five patients were admitted to the Medical-Surgical ICU. Forty were on the surgical service and 35 were on the medical service. Fifteen patients developed a healthcare-associated infection with methicillin-resistant Staphylococcus aureus (MRSA). Nine of the patients with MRSA infection were on the surgical
service. There were 230 patient days in the ICU for the surgical patients in January, and 325 patient days for medical patients. What was the incidence density of MRSA attack infection for patients on the surgical service?
Plague is endemic in parts of the Southwest United States. The word “endemic” means:
A pandemic differs from an epidemic in that:
Specificity of a test for infection or disease is calculated as:
A measure of dispersion that reflects the variability in values around the mean is called the:
In any normal distribution, the proportion of observations that are within two standard deviations of the mean is closest to:
The most important feature of nonparametric tests is that they:
Which of the following indicates a strong positive, correlation?
25. The Employee Health Service has notified the I P that seven employees have P aeruginosa folliculitis. Initial investigation reveals that six of the seven cases belong to the same health club. Working on the hypothesis that the whirlpool at the health club is associated with the infections, the IP decides to conduct a case-control study using two controls for each case. Which of the following groups is the most appropriate control?
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