# Summer Vocab Flashcards

What is Statistics?

the study of variability

What are the two branches of AP Stats?

inferential and descriptive

what are Descriptive Stats?

Tell me what you got! Describe to me the data that you collected, use pictures or summaries like mean, median, range, etc?

what are Inferential Stats?

Look at your data, and use that to say stuff about the BIG PICTURE? like tasting soup? a little sample can tell you a lot about the big pot of soup (the population)

what is Data?

Any collected information. Generally each little measurement? Like, if it is a survey about liking porridge? the data might be ?yes, yes, no, yes, yes? if it is the number of saltines someone can eat in 30 seconds, the data might be ?3, 1, 2, 1, 4,3 , 3, 4?

what is a Population?

the group you’re interested in. Sometimes it?s big, like “all teenagers in the US” other times it is small, like “all AP Stats students in my school”

what is a Sample?

A subset of a population, often taken to make inferences about the population. We calculate statistics from samples.

what is a parameter?

A numerical summary of a population. Like a mean, median, range? of a population

what is a Statisitc?

A numerical summary of a sample. Like a mean, median, range? of a sample.

Compare DATA-STATISTIC-PARAMETER using categorical example

Data are individual measures? like meal preference: ?taco, taco, pasta, taco, burger, burger, taco?? Statistics and Parameters are summaries. A statistic would be ?42% of sample preferred tacos? and a parameter would be ?42% of population preferred tacos.?

Compare DATA-STATISTIC-PARAMETER using quantitative example

Data are individual measures, like how long a person can hold their breath: ?45 sec, 64 sec, 32 sec, 68 sec.? That is the raw data. Statistics and parameters are summaries like ?the average breath holding time in the sample was 52.4 seconds? and a parameter would be ?the average breath holding time in the population was 52.4 seconds?

what is a census?

Like a sample of the entire population, you get information from every member of the population

does a census make sense?

A census is ok for small populations (like Mrs. Buckley’s students) but impossible if you want to survey “all US teens”

What is the difference between a parameter and a statistic?

BOTH ARE A SINGLE NUMBER SUMMARIZING A LARGER GROUP OF NUMBERS?. But pppp parameters come from pppp populations? sss statistics come from ssss samples.

If I take a random sample of 20 hamburgers 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.