# OCR MEI Statistics 1

What is cumulative frequency?
A running total of the frequencies calculated.
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What is a histogram?
A graph of scores/classes/ranges (x-axis) against frequency density (y-axis).
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What is the equation for frequency density?
Frequency density = Frequency/Class width.
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Linear Interpolation is to...
...calculate estimates of Q_1, Q_2 and Q_3 from grouped data.
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When is a tree diagram binomial?
If there are n trials, if each trial has 2 outcomes with probabilities of p and q (p=1-q), if the outcomes are independent or if the probabilities remain constant.
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What is the formula to allow us to find probabilities without drawing trees?
B(n,p) ; P(X=r) = nCr*p^r*q^(n-r).
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What is the complement?
If there are less data that you don't want, find the probability of them and subtract from 1.
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Instead of calculating the probability, what can we use?
The Cumulative Binomial Tables.
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0!=?
0!=1
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8!/5!
=8x7x6/5x4x3. To cancel the 5! from the top, 5! is added on the bottom. To cancel 2! from 5!, 2! is added to the top. 8!2!/5!5!
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What can factorials be used for?
Arrangements/orders i.e. ABCDEFGHIJ=10 people. There are 10 possibilities for seats so arrangement=10!
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What is an arrangement with respect to an order?
Different orders count as different arrangements.
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What is a selection with respect to an order?
Different orders count as one selection.
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n=number of objects, r=number of arrangements.
In general, n objects use r arrangements: n!/(n-r)!
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Number of selections=?
selections=n!/r!(n-r)!=nCr
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## Other cards in this set

### Card 2

#### Front

What is a histogram?

#### Back

A graph of scores/classes/ranges (x-axis) against frequency density (y-axis).

### Card 3

#### Front

What is the equation for frequency density?

### Card 4

#### Front

Linear Interpolation is to...

### Card 5

#### Front

When is a tree diagram binomial?