the field of study concerned with

1. the collection, organization, summarization and analysis of data

2. the drawing of inferences about a body of data when only part of the data is observed

1. Routinely kept records

2. Surveys

3. Experiments

4. External sources

when the value of a variable is determined by chance factors and cannot be predicted, this is known as a random variable

1. can be pigeon holed

2. Has no absolute 0

3. arithmetic cannot be done on it

4. For values A and B there is no C between them

1. Has an absolute 0

2. can have arithmetic operations done on it

3. for values A and B, there is a possible C between them

The largest collection of entitites for which we have an interest at a particular time

Bar chart or pie chart

DV interpretation

For a symetric graph, use mean and variance

For asymetric graph, use 5 number summary

for both, mode is also an acceptable statistic

The most important question in statistics...

1. Variable

2. (a) it is a cause that gets inbetween the cause and effect, changing the result

(b) and we don't know it is there

the sum from 1 to n of the square of the difference of the value and the mean, divided by the number of values minus 1

N+1

2

Q1=

(N+1)

4