Studied by 3 people
Confidence interval
point estimate ± MoE
Margin of error
t*(SE)
Standard error
likelihood of difference between population and sample mean σ/sqrt(n)
Null hypothesis
Ho
Alternative hypothesis
Ha
p-value
Probability of sample mean given that Ho is true
Chi Squared (χ²)
Test stat for many proportions
Alpha level (α)
Boundary used to decide test
Type 1 error
Rejecting Ho when true
Type 2 error
Failing to reject Ho when false
Skew
State of asymmetry
Statistic
Value calculated from data used to summarize the sample
Parameter
Any value used to represent the population
Measures of center
Mean and median
Categorical variable
Data graphed with a pi chart or segmented graph
Quantitative variables
Data graphed with a boxplot, histogram, or stem plot
Z-score
Measurement that shows a values distance from the mean in standard deviations (x - μ) / σ
Percentile
The value below which a certain percent of the distribution will lie
Outlier
Extreme values that don’t belong with the rest of the data
Measures of spread
Standard deviation, range, IQR
Inference
Using sample data to estimate/test population parameters
1.5 IQR test
Q1-((Q3-Q1)1.5) & Q3+((Q3-Q1)1.5)
Model
An equation or formula that simplifies and represents reality
Residual
Differences between data values and the values predicted by the model
Regression line/Line of best fit
Linear representation of a scatterplot
R^2
The fraction/percent variability the regression line accounts for in our data
Extrapolation
Making predictions outside the x values of our data
Leverage
Data points that are far from the mean have more ________
Influential point
When omitted, these points change the slope of the data set
Note 
Flashcard (49)