Summer Vocab

Question 1

What is statistics?

Answer 1

Study of variability.

Question 2

What is variability?

Answer 2

Differences, how things differ from others.

Question 3

What are 2 branches of AP Stats?

Answer 3

Inferential, and descriptive.

Question 4

What are descriptive stats?

Answer 4

Describing the data you collected. Summaries of mean, median mode, etc.

Question 5

What are inferential stats?

Answer 5

Explaining the big picture, a little example for big plot.

Question 6

What is data?

Answer 6

Any collected information. Each measurement.

Question 7

What is a population?

Answer 7

The group that you are interested in/studying.

Question 8

What is a sample?

Answer 8

A subset of a population to often make inferences about a population.

Question 9

Data V. Stats.

Answer 9

Data- individual things we collect to study.

Stats- The summarized version of the data.

Question 10

Data V. Parameters

Answer 10

Data- individual things we collect. Parameters-summarized

Question 11

What is a parameter?

Answer 11

A numerical summary of a population. Like mean.

Question 12

What is a statistic?

Answer 12

A numerical summary of a population. Mean if sample for ex.

Question 13

Data V. Stat. V. Parameter. from categorical ex.

Answer 13

Data- individual measurers (meal preference) Stats and parameters are summaries (42% preferred tacos)

Question 14

Data V. Stat. V. Parameter from quantitative ex.

Answer 14

Data- individual measurers. Stat- (Average breath from sample was 2.4 sec.) Para- (average breath of population was 2.4)

Question 15

What is a census?

Answer 15

Sample of an entire population, you get info from everybody.

Question 16

Does a census make sense?

Answer 16

A census is ok for small populations. (All US teens)

Question 17

Parameter V. Stat

Answer 17

BOTH ARE A SINGLE NUMBER SUMMARIZING A LARGER GROUP OF NUMBERS. Pppppp parameters come from ppppp populations sssss stats come from sss stats

Question 18

Random sample of 20 hamburgers at mcdanks and count number of pickles and 9 had pickles the 9 would be called?

Answer 18

The datum or data value.

Question 19

Data V. Stats.

Answer 19

Data- individual things we collect to study.

Stats- The summarized version of the data.

Question 20

A stat is a?

Answer 20

Sample of a summary.

Question 21

A parameter is a?

Answer 21

One number summary of a population. The truth.

Question 22

Sample V. Census?

Answer 22

Sample- info received from a small part of a population. Census- you get info from the entire population.

Question 23

Use population, parameter, census, sample, data, stats, inference, and population of interest in a sentence.

Answer 23

I was curious about a population parameter, but a census was too costly so I decided to use a sample, collect data, calculate the stats, and use them to make an inference about the population parameter.

Question 24

What are random variables?

Answer 24

If you randomly choose other people from a list, the attributes about them will be data collected from them for random variables.

Question 25

Quantitive V. Categorical variables?

Answer 25

Quantitive- numerical measures, like height and IQ. Categorical- are categories, like eye color and music preference.

Question 26

Difference between quantitive and categorical data?

Answer 26

Categorical- words (Yes, No)

Quantitive- numbers

Question 27

What is frequency?

Answer 27

How often something comes up.

Question 28

Data or datum?

Answer 28

Datum is singular. Data is multiple.

Question 29

What is a frequency distribution?

Answer 29

A table or a chart, that shows how often certain values or categories occur in a data set.

Question 30

What is meant by relative frequency?

Answer 30

The PERCENT of time something comes up (frequency/total).

Question 31

How do you find relative frequency?

Answer 31

DIVIDE FREQUENCY BY TOTAL.

Question 32

What is meant by cumulative frequency?

Answer 32

ADD up frequencies as you go.

Question 33

Make a guess as to what relative cumulative frequency is?

Answer 33

It is the ADDED up PERCENTAGES.

Question 34

What is the mean?

Answer 34

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

Question 35

Population mean V. Sample mean?

Answer 35

Population mean is the mean of the population. Sample mean is the mean of a sample which is a statistic.

Question 36

What is the median?

Answer 36

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

Question 37

What is the mode?

Answer 37

The most common, peaks of the histogram. Often used with categorical data.

Question 38

When we say the “average teenager” what are we talking about?

Answer 38

If talking about height, it might be mean, if talking about parental income, it might be median, if it is the music preference, it might be mode. It all depends.

Question 39

Words to know for sure. Part 1.

Answer 39

Stats- study of variability.
Variability- differences, how things differ.
Data- any collected information.
Population- the group you are interested in.
Sample- small group of a population.
Parameter- numerical summary of a population. (Mean, median, range, mode, of a summary).
Statistic- numerical summary of a sample. (Mean, median, range, mode of a population).

Question 40

Words to know for sure. Part 2.

Answer 40

Census- a sample of an entire population.
Datum- singular measurement.
Data- plural measurement.
Frequency- how often something comes up.
Relative frequency- the percent of time something comes up.
Cumulative frequency- adding the frequencies as you go.
Random variables- randomly chosen people or things from a list.

Question 41

Words to know for sure. Part 3.

Answer 41

Mean- the old average we used to calculate. Balancing point of histogram.
Median- the middlest number, splits area in half.
Mode- the most common, peak of histogram.