Stats Chapter 2 Cheat Sheet (DRAFT) by Xyloswagg96

can be set up as	table	or	graph
Two columns	first=­score	second= times occured
Σf = N
Obtaining ΣX	add scores	Obtaining ΣX^2	square then add

Proportion =	P=f/N
Percen­tage=	p(100)­=(f­/N)­(100)

Example:	Test Scores	low=50: high=100	combine= 50
Guideline 1=	10 class intervals	YOU WANT AROUND 10
Guideline 2=	Easy intervals	Width= How many points it will cover
Guideline 3=	Bottom Score start width
Guideline 4=	Intervals should be same width

Real Limits

Example: 5-7=

4.5-7.5

Y-Axis should be	2/3 or	3/4 the size of the	X-Axis
When something is measured numeri­cally	via interval or	Histograms

Charac­ter­istics of distri­but­ions=	Shape	Central Tendency	Variab­ility
Central Tendency measures=	where the center is
Shape=	shape	duhhhh
Variab­ility measures=	how far the range is

Example:	Supposed to work 8 hours	only work 4 hours	get paid 100 dollars
Normal =	find hourly wage	and multiply by the	hours you work
Interp­ola­tion=	4 is half of 8	so divide your salary by	half