ATI TEAS 7 Nurse Cheung MATH

Rational Number

any number that can be expressed as a ratio of two numbers (decimals must repeat!)

Irrational Number

number that cannot be expressed as a ratio of two numbers, the decimal is not repetitive

Coefficient

An integer that is written with a variable or is multiplied by the variable (15 in 15x)

Variable

A letter that expresses an unknown quantity (x)

Constant

A fixed value that is not associated with the variable (5)

Term

Single number or variable separated by + or - signs (15x, 5)

Estimation of meter

height from floor to doorknob

Centimeter estimation

width of paper clip

Kilometer estimation

airport runway

Gram estimation

paperclip weight

Milligram estimation

pinch of salt

Kilogram estimation

bag of rice

Rate

A ratio that compare two quantities with different units

Unit rate

A rate with a denominator of 1

direct proportion equation

y=kx (k is the constant proportionality y=5x)

nonproportional equation

y=mx+b

Direct proportional relationships

A relationship where one quantity increases, the other quantity increases at a constant rate, and same for decreasing

mean

average number of data set (add all and divide)

median

middle number in a data set (organize data set in order and find middle)

mode

most frequent number in a data set

range

the distance (difference) between the highest and lowest number in a data set

symmetry on graph

when you can draw a line in the middle and the sides mirror

bimodal distribution

2 peaks on a graph, with 2 modes

unimodal

a graph with one peak, one mode

bell shaped (mound)

mean = median = mode

uniform or rectangular

all entries, or classes of distribution have equal or approximate frequencies

no mode =

no peaks

left skewed

bulk of the data is left of the median, but the mode to the right (mean

right skewed

bulk of the data is on the right of the median, but the mode is on the left (mode>median>mean)

probability

mathematical concept that measures the likelihood of an event occurring and are expressed as a number between 0 and 1

probability equation

# of desired outcomes/# of total possible outcomes

probability > .5

event likely

probability < .5

event unlikely

and

multiply outcomes

either/or

add outcomes

how to find the probability of multiple events occurring

multiply the outcomes of each event

cartesian coordinate

how one variable relates to another (an X,Y graph)

scatter plot

correlation between variables (independent and dependent variable)

line graph

trends over time or continuous data

pie or circle chart

parts of a whole to compare proportions

bar graphs

compare between different groups or categories

bad graphs/misrepresentations

title, axes not labeled properly or do not have units, scaling of axes, best fit line too long

linear

straight line