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What is statistics
a tool that we use to make objective decisions from subjective data

Uses for stats
 represent data
 descriptive
 correlation
 inferential

Data
 info collected on subject
 usually numbers  height, weight, scores
 sometimes words or categories

Representation
graphs or charts

Descriptive
 Measures central tendency
 Measures variability

Measure of Central Tendency


Mean
 aka average
 add points and divide by number of data points

Median
 Order data points from least to greatest
 median is middle

Mode
most frequently occuring data point in series

Range
difference between the least and greatest data point in series

Standard Deviation
tells how tightly all data points are clustered around mean in series of data. this is a measure of variability

data distribution
 mean weight of students at 2 different schools
 graph the data

Correlation
measure relationship between two varaibles cannot measure cause and effect

Inferential
allow us to test hypothesis in an experiment for cause and effect while comparing

null hypothesis
keeps bias out of experiement

ttest
used to determine if the means of two samples are significantly different

P value
 level of significance of test
 he probability that two samples are likely to have come from the same two underlying populations that have the same mean