Data types

Question 1

Nominal Variables

Answer 1

a qualitative measure that uses discrete categories to describe qualitative differences.

examples:
types of pets: birds, fish, cats, dogs

gender, eye color, type of house…

Question 2

Ordinal Variables

Answer 2

rank-orders participants on some scale or attribute.

the difference between numbers does not convey fixed or equal differences

Examples

Education level Survey question response

Question 3

Interval Data

Answer 3

the distance between pairs of consecutive numbers is assumed to be equal

examples

Temperature

IQ scores
–NO MEANINGFUL ZERO POINT-

Question 4

Ratio variable

Answer 4

It has all the characteristics of interval data plus a meaningful zero point

Example

AGE, weight, cost of a car in dollars

Question 5

It is also important to note that more precise data

can always be

Answer 5

scaled down to less precise data

Question 6

what is this bar chart called?

Answer 6

A pictogram

Question 7

what’ s wrong here?

Answer 7

The area of the graphic is increased along with the height of the bar chart. It’s deceptive.

Question 8

The distribution of a categorical variable is summarized using:

Answer 8

Graphical display: pie chart or bar chart, supplemented by

Numerical summaries: category counts and percentages.

Question 9

[

Answer 9

including

Question 10

(

Answer 10

not including

Question 11

Medians

Answer 11

Question 12

Vagueness of the median

Answer 12

Question 13

What’s the difference between the two data sets?

Answer 13

Spread/Variability

Question 14

How are quartiles divided about the median?

Answer 14

Question 15

According to the Tukey Method

Suspected outliers are…

Answer 15

below Q1 - 1.5(IQR) or

above Q3 + 1.5(IQR)

Question 16

A 5 number summary

Answer 16

produces the values used for a boxplot

Question 17

medians, boxplots, and 5 number summaries are generally useful for…

Answer 17

measures of center and spread