Chapter 5 Notes:
2way table
rows=treatments
columns=outcomes
A twoway table involves listing all of the values for two categorical variables. All of the
values for one of the variables is listed in a vertical column. The values for the other variable
ar
Chapter 8 Notes:
experimental group
individuals receive a treatment to try to change the outcome variable
control group
individuals receive treatment that does NOT change the outcome variable (placebo)
factors
explanatory variable, what kind of treatment
Randomized Block Design:
Blocking is the arranging of experimental units in groups (blocks) that are similar to one
another.

Typically, a blocking factor is a source of variability that is not of primary
interest to the experimenter.
o
An example of a
Chapter 2 Notes:
mean (ave)
average, add values and divide by number of values; use with symmetric data
Getting a decimal value for the mean (or for the median, if you have an even number of
data points) is perfectly okay; don't round your answers to try
Chapter 4 Notes:
least squares regression line
formed by minimizing the squared vertical distance of each data point from the line
use the five summary statistics ,
, ,
, and r (i.e. the mean and SD of X,
the mean and SD of Y, and the Pearson correlation
Cohort Study Notes:
In statistics and demography, a cohort is a group of subjects who have shared a
particular event together during a particular time span (e.g., people born in Europe
between 1918 and 1939; survivors of an aircrash; truck drivers who smo
Chapter 1 Notes:
individuals
anything studied, people or things that data is collected from
population
every individual that has the characteristic being studied
sample
subset of a population, should represent the population
variable
characteristic of int
Chapter 3 Notes:
correlation
relationship between variables; uses quantitative variables
explanatory variable
independent variable; may be causing the response variable to change; the variable we
control
An independent variable is also known as a "predict
Chapter 7 Notes:
observational study
no attempt made to influence the outcome variable, only observing and recording
experimental study
deliberately imposing a treatment in order to change the outcome variable
confounding variables
two variables (explanat