Random Sampling
Simple Random Sampling
Choosing a specific number of members randomly from the entire population
Triangular prism volume and SA
V=lwh/2
SA=lw+hw+ 2ls
am×an = a. m+n
Product Rule
Statistics
Numerical data or the collection, organization, and analysis of numerical data
Partial Variation
Y-Intercept is never (0,0)
y=mx+b
Systematic Random Sampling
Choosing members of a population at fixed intervals from a randomly selected member
Sphere volume
Sphere SA
V=4/3πr^3
SA=4πr^2
am/an = a. m-n
Quotient Rule
Census
A survey of all members in the population
Direct Variation
Y-Intercept is always (0,0)
y=mx
Non-Random Sampling
Using a method that is not random to choose a sample from the population
Cone volume and SA
V=⅓(πr^2 x h)
SA=πr^2 + πrs
(am)n = a. mn
Power Rule
Parallel Lines
-Lines never meet
-Slope is always the same but y-intercept is never the same
Primary Data
Original data that a researcher gathers specifically for a particular experiment or survey
Simple Random Sampling
Choosing a specific number of members randomly from the entire population
Cube/rectangular prism SA
Cube/rectangular prism volume
SA=2hw+2hl+ 2wl
V=lwh
a0 = 1.
Perpendicular Lines
-All 4 angles
-90 degrees
-Opposite Reciprocal.
Secondary Data
Data that someone else has already gathered for some other purpose
Clustered/Stratified
Dividing a populaion into distinct groups and then choosing the same the same fraction of members from each group
Cylinder volume
Cylinder surface area
V=πr^2 x h
SA=2πr^2 + 2πrh
a-m = 1/a. m
Pyramid volume
Pyramid SA
V=⅓(lwh)
SA=l(length)s(slant)+w(width)s(slant)+lw
Nonagon sum interior angles
180x7=1260 degrees