Vocab

Question 1

What is variability

Answer 1

Differences; how things differ

Question 2

What is statistics(textbook)

Answer 2

The science of collecting, organizing, summarizing, analyzing, and making inferences from data

Question 3

What are 2 major branches of statistics we will study this year

Answer 3

Inferential and descriptive

Question 4

What are descriptive stats

Answer 4

Numbers and pictures that describe nature of a data set, provide info about data that is present

Question 5

What are inferential stats

Answer 5

Making inferences; making predictions by using statistical data

Question 6

Compare descriptive to inferential

Answer 6

Descriptive seeks to tell you about what is in the data at hand, inference reaches out the world at large

Question 7

What is data

Answer 7

Any collected information. Generally each little measurement

Question 8

What is a population

Answer 8

The group you’re interested in

Question 9

Compare population to sample

Answer 9

Populations are generally large, and samples are small subsets of these population.
We take samples to make an inference about what we think is true in population. We use statistics to estimate parameters

Question 10

What is a parameter

Answer 10

A numerical summary of a population( ex. Mean median range)

Question 11

What is a statistic

Answer 11

A numerical summary of a sample

Question 12

What is a sample

Answer 12

A subset of population, often taken to make inferences about the population

Question 13

Compare Data-statistic- parameter using categorical example

Answer 13

Data are individual measures( ex. Taco taco pasta taco). Statistics and parameters are summaries.
Statistics: 42 percent of sample preferred taco
Parameters: 42 percent of population preferred taco

Question 14

Compare Data-statistic-parameter using quantity example

Answer 14

Data are individual measures ( ex. 45s 70s 60s).
Statics: the average of time of the sample is xxxx
Parameters: the average if time of population is xxx

Question 15

What is a census

Answer 15

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

Question 16

Does a census make sense

Answer 16

A census is ok for small populations but not a good idea for big ones. It would be expensive, time consuming, and almost impossible

Question 17

What is the difference between a parameter and a statistic

Answer 17

Parameters con from population

Statistics come from samples

Question 18

What is the difference between a sample and a census

Answer 18

With a sample, you get information from a small part of the population, in a census, you get info from the entire population

Question 19

What are random variables

Answer 19

Variables whose values are determined by chance

Question 20

What is statistics(Nystron’s definition)

Answer 20

The study of variability