# BIOSTATISTICS FOR USMLE

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 Author: Camilomd ID: 62913 Filename: BIOSTATISTICS FOR USMLE Updated: 2011-01-30 11:04:19 Tags: BIOSTATISTICS USMLE Folders: Description: Biostatistics key points or USMLE Show Answers:

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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

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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