# USU

 What is statistics a tool that we use to make objective decisions from subjective data Uses for stats represent datadescriptivecorrelationinferential Data info collected on subjectusually numbers - height, weight, scoressometimes words or categories Representation graphs or charts Descriptive Measures central tendencyMeasures variability Measure of Central Tendency mean median mode Measure of Variability range standard deviation Mean aka averageadd 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 schoolsgraph 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 t-test 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 AuthorAnonymous ID25236 Card SetUSU DescriptionModule 8 Updated2010-06-29T19:55:50Z Show Answers