Unit 1

Question 1

categorical variable

Answer 1

describes but does not rank

Question 2

quantitative variable

Answer 2

measures or ranks

Question 3

What is a bar graph used for?

Answer 3

A bar graph is used to display and compare the frequency, count, or other measures for different categories.

Question 4

True or False: A two-way table can show the relationship between two categorical variables.

Answer 4

True

Question 5

Fill in the blank: A __________ plot is a graphical display that shows the distribution of a quantitative variable using dots.

Answer 5

dot

Question 6

Short Answer: Describe a stemplot and its purpose.

Answer 6

A stemplot is a graphical method for displaying quantitative data in a way that retains the original data values while showing the distribution.

Question 7

What type of data is best represented by a mosaic plot?

Answer 7

Categorical data

Question 8

What is a histogram?

Answer 8

• A histogram is a graphical representation of the distribution of numerical data, showing the frequency of data points within specified ranges (bins).
• can display both continuous and discrete data
• bars on a histogram are adjacent

Question 9

What term describes the overall shape of a distribution?

Answer 9

Distribution shape

Question 10

True or False: The center of a distribution can be described using the mean, median, or mode.

Answer 10

True

Question 11

Fill in the blank: The __________ of a distribution refers to the spread or dispersion of the data points.

Answer 11

variability

Question 12

Which measure is NOT typically used to describe the center of a distribution: mean, median, mode, or range?

Answer 12

range

Question 13

What do we call data points that lie significantly outside the overall pattern of a distribution?

Answer 13

outliers

Question 14

What is the definition of standard deviation?

Answer 14

Standard deviation is a measure of the amount of variation or dispersion in a set of values.

low SD indicates that the data points are close to the mean

Question 15

5-number summary

Answer 15

• minimum
• Q1
• median
• Q3
• maximum
• IQR

Question 16

IQR

Answer 16

range of middle 50% (Q3-Q1)

a measure of variance

Question 17

finding outliers

Answer 17

IQR x 1.5

Question 18

What is a box plot used for?

Answer 18

A box plot is used to visually represent the distribution of a dataset, highlighting the median, quartiles, and potential outliers.

the box represents the IQR; the line inside the box rperesents median

doesn’t show mean

Question 19

z-score

Answer 19

of standard deviations for a given x above/below the mean