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Identify the median in the following list of numbers: 6, 2, 9, 7, 1, 4
In a study of whether Operating room A (OR A) is associated with
a higher number of surgical site infections (SSis) than Operating room B (OR B), the infection preventionist (IP) is testing whether:
Ho: OR A SSI rate = OR B SSI rate
Ha: OR A SSI rate;>! OR B SSI rate
The IP concludes that the SSI rate in OR A is not equal to the SSI rate;in OR B, but in reality the t wo rates are equal. What type of statistical error has she committed?
For which of the following procedure(s) is the surveillance period for deep incisional or organ/space SSI 90 days?
1) Cesarean section
3) Coronary artery bypass graft
An appropriate indicator to monitor process compliance would be:
What key infection control activity is defined as the systematic, ongoing collection, management, analysis, and interpretation of data followed by the dissemination of these data to public health programs to stimulate public health action?
An IP is reading a journal article that states that the data the authors collected are normally distributed. What does this mean?
Which of the following is indicative of
An IP is preparing the quarterly report for the Infection Control Committee. What information will be needed to calculate a CLABSI rate for the ICU?
1) The total number of patients in the unit for the time period
2) The total number of central line catheters for the time period
3) The number of patients who had bloodstream infections identified
4) The number of device days for the time period
What type of rate would the IP want to calculate to give feedback to the surgeons at her facility?
The IP has been benchmarking her data to other facilities performing similar activities for a period of time. The IP should analyze the entire process to ensure that which of the following conditions are met?
1) Standardized definitions are used consistently
2) Overall rates are used to accurately track trends over time
3) Adequate training of personnel to collect, store, manage, and analyze data
4) Data are calculated using the same methodology as a nationally validated system
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 lies 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?
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?