Vocab
out of pattern or large residuals
outliers
mean equation
np=mean
What does this symbol mean "n"?
sample size
Every group of size n has an equal chance of being selected
Simple Random Sample
The thing being changed or imposed on individuals in an experiment.
treatment
big changes to slope, y intercept, or r
influential value
large count equations
np greater than or equal to 10
n(1-p) greater than or equal to 10
What does this symbol mean "N"?
population size
dividing the population into groups (strata) based on a characteristic and sampling from each
stratified random sampling
A group used for comparison that receives no treatment
control group
minimizes the sum of squared residuals
least square regression lines
The equation for residual
actual-predicted
What does this symbol mean "b"?
slope
dividing the population into groups based on location and sampling everyone in a few randomly selected groups
cluster sampling
This principle of design ensures that the effects of chance are balanced out by using enough experimental units
replication
very large or very small x values
high leverage
10% condition equation
n (less than or equal too) 0.10%N
What does this symbol mean "r"?
correlation coefficient
Choosing individuals who are easiest to reach
convenience sample
Experimental design where units are grouped by a shared characteristic (like age or gender) before being assigned treatments
randomized block design
a statistic that measures the proportion of variance in a dependent variable that is predictable from the independent variable in a regression model
coefficient of determination or r2
standard deviation equation
square root of np(1-p)
What does this symbol mean "r2"?
coefficient of determination
Selecting every kth individual from a list starting at a random point
systematic random sampling
Neither the subjects nor the researchers interacting with them know which treatment is being given
double-blind