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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

1. NEGATIVELY SKEWED DISTRIBUTION CURVE, the tail goes to the?
2. POSITIVELY SKEWED DISTRIBUTION CURVE, the tail goes to the?
 1. LEFT.
 2. RIGHT.

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.

So, Here is the graphic you need to Memorize!!


In a normal distribution curve, what percent of the cases are below 2 SD's below the mean?
2.5%

In a normal distribution curve, what percent of the cases are above 1s below the mean?
84%

A student took 2 tests:
On which test did the student better.
Test A

