ap stats Flashcards
what is stats
the study variability
variability
how things differ
what are the 2 branches of AP stats
inferential and descriptive
inferential
using a small sample to tell about the whole thing
descriptive
describe the data
compare inferential and descriptive
one describes while the other uses the data
data
any collected information
population
the group you’re interested in
sample
a subset of a popluation
compare population and ssmple
we take samples to find data for the population
compare data and stats
use the data to make a stat
parameter
a numerical summery of a popluation
a statistic
a numerical summery of a sample
census
sample of an entire population
if i take a random sample of 20 burgers from FIVE GUYS and count the number of pickles on a bunch of them… and one of them had 9 pickles, then the number 9 from that burger would be called
a datum, or a data value
if i take a random sample 20 hamburgers from FIVE GUYS and count the number of pickles on a bunch of them… and the average number of pickles was 9.5 then 9.5 is considered a
statistic
if i take a random sample 20 hamburgers from FIVE GUYS and count the number of pickles on a bunch of them… and i do this because i want to know the true average number of pickles on a burger at FIVE GUYS, the true average number of pickles is considered
parameter
difference between a sample and cencus
sample is small part while census is the whole,
use the words population, parameter, census, sample, data, statistics, inference, population of interest.
i was curious about a population parameter, but a census was too costly so i decided to choose a sample, collect some data, calculate a statistic and use that statistic to make an inference about the population parameter
the flavor of each individual thing in the spoon is the_, the entire spoon is the__, the flavor of all of that stuff together is like the_, and you use that to the entire pot of soup, which would be the __.
data, sample, stat, make an inference, parameter.
random variables
random chosen things
difference between quantitative and categorical variables
numerical vs catigorical
quantitative variable
numerical variable
categorical variable
like catigories
another name for categorical variable
qualitative
quantitative data
actual numbers from gathered from subjects
categorical data
individual category from a subject
random sample
random, like rolling dice
frequency
how often something comes up
data or datum
table or chart that shows how often certain values or categories occur in a data set.
relative frequency
the percent of time something comes up
how do you find relative frequncey
divide frequency by total
what is meant by cumulative frequency
add the frequency’s as you
relative cumulative frequency
addded up percentages
differences of chart and histogram
categorical data vs quantitative
mean
average used to calculate
symbols used for poplulation mean and sample mean
Mu and x-bar
how to know mean vs median on histogram
balancing point vs the middle
what is the median
middle number
mode
most common number
when do we use mode
with categorical variables
why not always use mean
its not resilient
when saying the average teen what are we talking about
depends on the stat
how are mean, median, and mode positioned in a histogram skewed left
goes from left to right
how are mean, median, and mode positioned in a histogram skewed righ
right to left
who chases the tail
the mean chases the tail
