Descriptive Statistics: Representation

Question 1

Data distributions

Answer 1

used often in statistics. They are graphical methods of organizing and displaying useful information

Question 2

Dot plots

Answer 2

show numerical values plotted on a scale

Question 3

frequency

Answer 3

rate of occurrence

Question 4

Histograms

Answer 4

display data in ranges, with each bar representing a range of numeric values
useful for showing frequencies of a large set of data
a graphical representation of the distribution of data

Question 5

Box plots

Answer 5

rectangular representations of data. They do not give the frequency of values
graphical representation of the distribution in a data set using quartiles, minimum and maximum values on a number line

Question 6

box-and-whisker plots

Answer 6

Another name for box plots

Question 7

tally chart

Answer 7

consists of a table with tally marks that show frequency of occurrences in each category

Question 8

symmetrical

Answer 8

where the shape created is mirrored nearly perfectly across a line

Question 9

skewed

Answer 9

which is where the shape of a graph peaks to the left or the right of the center

Question 10

gap

Answer 10

is an area in the data set where no observations have been made

Question 11

bimodal

Answer 11

where the data set has two different modes

Question 12

Skewness in statistics

Answer 12

represents an imbalance and asymmetry from the mean of a data distribution

Question 13

positive skew

Answer 13

means that the extreme data results are larger

Question 14

negative skew

Answer 14

means the extreme data results are smaller

Question 15

Standard deviation

Answer 15

tells you how different and varied your data set really is. Standard deviation shows you how far your numbers spread out from the mean and median

Question 16

dot plot

Answer 16

a visual representation of data using intervals or categories of variables; the dots represent an observation in the data

Question 17

Categorical data

Answer 17

is data that is grouped by type or object, not by numbers

Question 18

Numerical data

Answer 18

is information that is measurable. It is always collected in number form.

Question 19

quartile

Answer 19

is a group of values and/or means that divide a data set into quarters, or groups of four

Question 20

interquartile range

Answer 20

is a value that is the difference between the upper quartile value and the lower quartile value

Question 21

median

Answer 21

is the midpoint value of a data set, where the values are arranged in ascending or descending order.

Question 22

scatterplot

Answer 22

is a graph of ordered pairs showing a relationship between two sets of data

Question 23

bivariate data

Answer 23

which are two sets of variables that can change and are compared to find relationships.

Question 24

correlation

Answer 24

which is the relationship between two variables or sets of data

Question 25

independent variable

Answer 25

is a condition or piece of data in an experiment that can be controlled or changed

Question 26

dependent variable

Answer 26

is a condition or piece of data in an experiment that is controlled or influenced by an outside factor, most often the independent variable

Question 27

positive correlation

Answer 27

where the dependent variables and independent variables in a data set increase together