Chapter 1
Variability – the phenomenon of a variable taking on different values or categories from observational unit to observational unit
Categorical – this variable records a group designation, such as gender
Chapter 3
Sample size – the number of observational units (people or objects) studies in a sample
Representative – when a sample has similar characteristics to the population
Sampling frame 
Chapter 4
Simple random sampling – eliminates sampling bias by giving every observational unit in the population an equal chance of being selected
Table of random digits – a better alternative for selecting a simple random sample
Precision – the precision of a sample statistic refers to how much the values vary from sample to sample. Precision relates to sample size: sample
statistics from larger samples are more precise and close together than those from smaller samples.
Chapter 5
Treatment  the explanatory variable group
Placebo effect – when subjects respond positively to being given a treatment, whether the treatment is actually affective
Randomized comparative experiment – when each subject has an equal chance of being assigned to any of the treatment groups
Chapter 6
Independence – two categorical variables are said to be independent if the conditional distributions of one variable are identical for every
category of the other variable
Chapter 7
Bins – subintervals
Stemplot – created by taking the quantitative data by separating each data value into 2 pieces: a stem and leaf
Relative frequency – the proportions
Frequency – the number
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 Spring '10
 Garant
 Least Squares, Normal Distribution, Regression Analysis, Standard Deviation, Errors and residuals in statistics

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