# Statistics revision cards

Here are some statistic revision cards for edexcel statistics 1 ( s1 ) paper.

- Created by: sebastian parsons
- Created on: 13-05-13 17:27

First 255 words of the document:

In a box plot outliers are

1.5 interquartile ranges above the upper quartile

or

In a histogram, total area under bars is

PROPORTIONAL to total frequency.

1.5 interquartile ranges below the lower quartile

Always refer to outliers or extreme values but not

anomalies.

PMCC is not affected by linear coding. The three properties of a normal distribution are

So multiplying every value of x or y by the same (or 1. The curve is bell shaped

indeed, adding, subtracting, dividing) does not affect 2. The curve is symmetrical about the mean

the PMCC 3. mean = mode = median

Positive skew mode < median < mean

LOOK AT THE TAIL!!

Events are independent if they do not affect each

Median closer to lower quartile than higher quartile

others outcomes

Higher frequencies at lower values

P(AB) = P(A) x P(B)

Or you could say

P(A|B)= P(A) or

P(B|A) = P(B)

Negative skew mean < median < mode

LOOK AT THE TAIL!!

Median closer to upper quartile than lower quartile

Higher frequencies at higher values When finding the lower quartile work out ¼ n

If this is a decimal use the first value after (e.g. 6.5

you would use 7th value)

If this isn't a decimal use the average of this value

and the one after (e.g. 7 you would average 7th

and 8th value)

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