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| A frequency distribution shown as a bar graph is called a __________________. |
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| The mean (or average) of a sample can be calculated only on which of the following leves of data |
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| A set of data are collected on the ages of patients presenting with sporting event injuries. The age that appeared most often in the data set was 37 years. In this case, 37 years represents the _________ of the data set |
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| In the same data set above, half of the patients were below 25 years of age, and half were above age 25. In this case, 25 years represents the __________ of the data set. (Card 3) |
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| From a group of 100 patients with Hepatitis B, 95 tested positive for the disease using a new laboratory test. The 95/100 = 0.95 represents the ___________ of the test. |
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| The lowest systolic blood pressure measured before the application of the MAST garment in a sample of trauma patients was 48 and the highest was 88. Thus, 40 represents the _________ of the data set. |
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| A data set containing heart rates shows that the measured heart rates vary very little from the mean of 88. Because of the grouping of heart rates tightly around the mean, we would expect the standard deviation to be __________. |
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| In a normally distributed (bell-shaped) distribution of data, what percentage of observed values will lie within 1 standard deviation of the mean? |
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| A data point that is extremely low or extremely high relative to the rest of the data set is called an outlier. Which measure of dispersion is most affected by an outlier? |
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| Your physician has recommended that you begin taking an antihypertensive and he recommends drug A. In a previous study, 7% of those receiving drug A experienced a stroke compared with 18% receiving drug B. What is the number needed to treat for drug A in order to prevent one additional stroke? |
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| At a recent medical trade show, one of the vendors was demonstrating for you a new device for performing liver biopsy. The vendor claims that this new device has a much lower incidence of post-procedure bleeding. Being the astute statistician, you ask him abut the bleeding rate of the device. He replies that the bleeding rate is 3%. How many patients would have to have biopsies with this device to encounter one episode of bleeding? |
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| A meta-analysis of intubation via the nasal route has determined that the success rate of nasal intubation is 67%. How many patients would have to be intubated by the nasal route in order to encounter one patient in whom nasal intubation would fail? |
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| A meta-analysis of intubation found that the nasal route had a success rate of 67% while the oral route enjoyed a success rate of 91%. How many patients would need to be intubated orally in order to prevent one failed attempt via the nasal route? |
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| What does it mean if a lab procedure for diagnosing leukemia is said to be highly sensitive, but low on specificity? |
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| If the disease is present then the lab test is likely to detect it AND not everyone free of disease will have a negative lab result |
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| What does it mean if a lab procedure for detecting a disease is said to be low on sensitivity and low on specificity? |
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Definition
1) The test is unlikely to have a positive result for those with the disease.
2) the test is unlikely to have a negative result for those free of disease.
3) this is a poor lab test |
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| In a normally distributed (bell-shaped) distribution of data, what percentage of observed values will lie within 2 standard deviations of the mean? |
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| In a normally distributed (bell-shaped) distribution of data, what percentage of observed values will lie within 3 standard deviations of the mean? |
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| Which of the following would be considered the most outlying data point? |
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| a data point lying greater than 3 standard deviations from the mean |
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| Which of the following represents the best drug? |
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| Which fo the following represents the best drug? |
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| Ability of a test to single out those WITH the disease. |
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| Ability of a test to classify those WITHOUT the disease. |
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| Number who have the disease and have a POS test + number who have the disease but have a NEG test/Total number tested |
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How well a test performs correct out of all uses.
(True POS + True NEG)/Total tested |
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| Gives frequency of when a POS test =disease |
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