Summer Vocab

Question 1

What is variability

Answer 1

Differences.. variabilities are everywhere everyone’s different, stats look at these differences

Question 2

What are 2 branches of AP stats

Answer 2

Inferential and descriptive

Question 3

What are DESCRIPTIVE STATS

Answer 3

Describe the data that you collected, use pictures or summaries like mean median and mode

Question 4

What are INFERENTIAL STATS

Answer 4

Use your data to describe the BIG PICTURE, a sample can tell you about the whole population

Question 5

What is data

Answer 5

Any collected information, ex it could be a survey: yes yes no yes no no, color of eyes: blue green drown green green

Question 6

What is the population

Answer 6

The group of interest

Question 7

What is a sample

Answer 7

A portrait on of the population, we take samples to make inferences ab pop. We use statists to estimate parameters

Question 8

Data vs statistics

Answer 8

Data is the little bits of info from the subjects the individual things we collect- statistics is when you summarize them, by using mean for ex

Question 9

Data vs parameters

Answer 9

Data little bits of the individual subjects- parameters is when u have data from each member of the entire pop., summary

Question 10

Parameter vs statistic

Answer 10

Parameters Is a numerical summary of a pop. Like mean median range-statistic is the same but summary of a sample

Question 11

Categorical example of DATA STAT PARAMETER

Answer 11

Ex meals preferences
Data-“taco taco pizza”
Statistics and parameter- s:”42% of Sample was52.4 sec “
P: “42% of pop preferred tacos

Question 12

Compare data-statistics-parameter using quantitive ex

Answer 12

Data are individual measures like how long u can hold ur breath

Raw data- “50sec, 58sec, 32sec,60sec”
Stays&parameters- s:”42% of a sample preferred tacos” P: “42% of pop preferred tacos”’
Parameter- “the average breath holding tune in the pop. Was 52.4sec”

Question 13

What Is a census

Answer 13

Sample of entire pop, you get information from every member of the pop

Question 14

Does a census make sense

Answer 14

Census is okay for small pops but impossible if u have a huge pop like “all US teens”

Question 15

If I take a random sample of 20 hamburgers from five guys and count the # of pickles on a bunch of them…. and one of them had 9 pickles, then the number 9 from that burger would be called ______?

Answer 15

A datum

Question 16

If I take random sample of 20 hamburgersfrom five guys in Count the number of pickles on a bunch of them… and the average number of pickles was 9.5, what’s 9.5?

Answer 16

Statistic (summery of a sample)

Question 17

If I take random sample of 20 hamburgersfrom five guys in Count the number of pickles on a bunch of them… and I do this bcuz I want to know the true average # of pickles on a burger at FIVE GUYS, that number is a ______?

Answer 17

Parameter, a one number summary of the pop.

Question 18

What are random variables

Answer 18

If you randomly choose people from a list l, then all the physical characteristics would be considered random

Question 19

What is frequency

Answer 19

How often something comes up

Question 20

What is a frequency distributional

Answer 20

A table, chart, show how valued or categories occur in a data set

Question 21

What is meant by relative frequency and how do u find it

Answer 21

The percent of time something comes up (frequency/total)

I

Question 22

What is Meant by cumulative frequency

Answer 22

ADD up the frequencies as you go. Suppose you are selling 25 pieces of candy. You sell 10 the first hour, 5 the second, 3 the third and 7 in the last hour, the cumulative frequency would be 10, 15, 18, 25

Question 23

What is the mean?

Answer 23

the old average we used to calculate. It is the balancing point of the histogram

Question 24

What’s the difference between mean and sample mean

Answer 24

opulation mean is the mean of a population, it is a parameter, sample mean is a mean of a sample, so it is a statistic. We use sample statistics to make inferences about population parameters

Question 25

What is the median

Answer 25

The middlest number, it splits area in half (always in the POSITION (n+1)/2 )

Question 26

What is the mode

Answer 26

the most common, or the peaks of a histogram. We often use mode with categorical data

Question 27

When do we often use mode

Answer 27

With categorical variables. For instance, to describe the average teenagers preference, we often speak of what “most” students chose, which is the mode. It is also tells the number of bumps in a histogram for quantitative data (unimodal, bimodal, etc.)

Question 28

When we say “the average teenager” 42 are we talking about mean, median, or more

Answer 28

depends, if we are talking height, it might be the mean, if we are talking about parental income, we’d probably use the median, if we were talking about music preference, we’d probably use the mode to talk about the average teenager.