Unit 1 Stats

Vocabulary

100

_________  is an object described in a set of data. Can be people, animals, or things

Individual

200

_________ is a characteristic that changes from one individual to another.

Variable

300

A variable that takes on numerical values for a measured or counted quantity

Quantitative variable

400

A variable that takes on values that are category names or group labels

Categorical variable

500

What are the two types of Quantitative variables?

Discrete and Continuous

Random

100

Does "time" fall under discrete or continuous quantitative variables?

Continuous

200

What type of distribution shape has the bulk of its data on the right and decreases to the left?

Skewed Left

300

1|2469

2|1588

3|3356

Key: 0|1=1

What is the value of the 4 on the right side of the 1?

14

400

What category of "socs" does stating the range fall into?

Spread

500

How do you find the Interquartile Range?

Q3-Q1

Distribution

100

What are the 3 types of shapes that a distribution can have?

Symmetric, Skewed Left, Skewed Right

200

What would be considered an outlier in a distribution?

Gaps and Clusters

300

How do you find the center of a distribution?

find the median

400

_______ is how similar/varied the set of values is for a variable

Spread

500

What does the second "C" in "socs" stand for and why is it needed?

Context and is needed to give the reader information to what the question is pertaining to

central tendencies and variation

100

What is the difference between x-bar and Mu?

x-bar: mean of sample

Mu: mean of population

200

How do you find the mean if there are even numbers?

Find the mean of the two middle values

300

What is the relationship between mean and median? 

If a distribution is ROUGHLY SYMMETRIC, the mean and median are the same

SKEWED RIGHT: mean is higher than median

SKEWED LEFT: mean is lower than median

400

What is standard deviation and how do you interpret it?

measures the average distance of the observations from their mean.

On average the values in the distribution of _____ vary from the mean by _____ units.

500

_____ is the average squared distance 

Varience

Outlier Rules

100

What are the two outlier rules called?

1.5 x IQR rule 

2 Standard Deviations Rule

200

How do you use the 1.5 x IQR rule?

1.5 (IQR)

Q1 - 1.5 (IQR)

Q3 + 1.5 (IQR)

300

How do you find high and low outliers from the 2 SD rule?

LOW: mean - 2(Sx) 

HIGH: mean + 2(Sx)

400

How do you know when to use which outlier rule?

2SD: wider interval, fewer outliers

1.5 IQR: narrower intervals, more outliers

500

What is the best measure of center and spread for a symmetric distribution? Skewed distributions?

SYMMETRIC: mean, SD

SKEWED: median, IQR