OCR MEI Statistics 1

What is cumulative frequency?
A running total of the frequencies calculated.
1 of 15
What is a histogram?
A graph of scores/classes/ranges (x-axis) against frequency density (y-axis).
2 of 15
What is the equation for frequency density?
Frequency density = Frequency/Class width.
3 of 15
Linear Interpolation is to...
...calculate estimates of Q_1, Q_2 and Q_3 from grouped data.
4 of 15
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.
5 of 15
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).
6 of 15
What is the complement?
If there are less data that you don't want, find the probability of them and subtract from 1.
7 of 15
Instead of calculating the probability, what can we use?
The Cumulative Binomial Tables.
8 of 15
0!=?
0!=1
9 of 15
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!
10 of 15
What can factorials be used for?
Arrangements/orders i.e. ABCDEFGHIJ=10 people. There are 10 possibilities for seats so arrangement=10!
11 of 15
What is an arrangement with respect to an order?
Different orders count as different arrangements.
12 of 15
What is a selection with respect to an order?
Different orders count as one selection.
13 of 15
n=number of objects, r=number of arrangements.
In general, n objects use r arrangements: n!/(n-r)!
14 of 15
Number of selections=?
selections=n!/r!(n-r)!=nCr
15 of 15

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?

Back

Preview of the front of card 3

Card 4

Front

Linear Interpolation is to...

Back

Preview of the front of card 4

Card 5

Front

When is a tree diagram binomial?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Statistics resources:

See all Statistics resources »See all Cumulative Frequency. resources »