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What Is Statistics: Crash Course Statistics #1

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Let's find that p-value!!!

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This is the "bell-shaped" curve of the Standard Normal Distribution. It is a
Normal Distribution with mean 0 and standard deviation 1.

It shows you the percent of population:

between 0 and Z (option "0 to Z")

less than Z (option "Up to Z")

greater than Z (option "Z onwards")

It only display values to 0.01%

The Table

You can also use the table below. The table shows the area from 0 to Z.

Instead of one LONG table, we have put the " 0.1"s running down, then the " 0.01"s running along. (Example of how to use is below)

Example: Percent of Population Between 0 and 0.45

Start at the row for 0.4, and read along until 0.45: there is the value 0.1736

And 0.1736 is 17.36%

So 17.36% of the population are between 0 and 0.45 Standard Deviations from the Mean.

Because the curve is symmetrical, the same table can be used for values going either direction, so a negative 0.45 also has an area of 0.1736

Example: Percent of Population Z Between −1 and 2

From −1 to 0 is the same as from 0 to +1:

At the row for 1.0, first column 1.00, there is the value 0.3413

From 0 to +2 is:

At the row for 2.0, first column 2.00, there is the value 0.4772

Add the two to get the total between −1 and 2:

0.3413 + 0.4772 = 0.8185

So 81.85% of the population are between −1 and +2 Standard Deviations from the Mean.

1486, 1487, 1488, 1489, 1490, 1491, 3846, 3847, 3848, 3849

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This is the "bell-shaped" curve of the Standard Normal Distribution. It is a Normal Distribution with mean 0 and standard deviation 1. It shows you the percent of population: between 0 and Z (option "0 to Z") less than Z (option "Up to Z") greater than Z (option "Z onwards") It only display values to 0.01% You can also use the table below.

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Reject or Fail to Reject?

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Statistical Tests: Choosing which statistical test to use

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We've all been there.

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Short, humorous TEDtalk

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Arthur Benjamin: Teach statistics before calculus!