BIOSTATISTICS FOR USMLE

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Author:
Camilomd
ID:
62913
Filename:
BIOSTATISTICS FOR USMLE
Updated:
2011-01-30 11:04:19
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BIOSTATISTICS USMLE
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Description:
Biostatistics key points or USMLE
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  1. Statistics deals with the world as distributions

    1.Mean definition and how to calculate it...
    2.Median defintion and how to get it...
    3.Mode definition and how to get it...



    Mean: average. (sum of results of observations/number of observations)

    Median: Value at the 50th percentile. if you have an even set of values, take the average of the two values around 50th percentile.

    Mode: More frequent value
  2. 1. NEGATIVELY SKEWED DISTRIBUTION CURVE, the tail goes to the?

    2. POSITIVELY SKEWED DISTRIBUTION CURVE, the tail goes to the?
    • 1. LEFT.
    • 2. RIGHT.
  3. Standard Deviation is a stable measure of dispersion

    What do you need to know for the exam about this?
    That in any normal curve there is a constant proportion of cases that fall within 1,2, and 3 SD's

    • 1 SD: 68% of the cases.
    • 2 SD: 95.5% of the cases.
    • 3 SD: 99.7% of the cases.
  4. So, Here is the graphic you need to Memorize!!
  5. EXAMPLES?
    BRING IT!!
  6. In a normal distribution curve, what percent of the cases are below 2 SD's below the mean?
    2.5%
  7. In a normal distribution curve, what percent of the cases are above 1s below the mean?
    84%
  8. A student took 2 tests:



    On which test did the student better.
    Test A

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