Descriptive Stat

Question 1

What is a raw data?

Answer 1

Ungrouped data

Question 2

organized into a frequency distribution

Answer 2

Grouped data

Question 3

Summary of data presented in the form of class intervals and frequencies

Answer 3

Frequency distributions

Question 4

Average of two class endpoints

Answer 4

Class Midpoint

Question 5

proportion of the total frequency that is any given class interval in a frequency distribution (individual F divided by total F)

Answer 5

Relative Frequency

Question 6

running total of frequencies through the classes of a frequency distribution

Answer 6

Cumulative Frequency

Question 7

a series of contiguous bars or rectangles that represent the frequency of data in given class intervals. Useful for differentiating frequencies of class intervals.

Answer 7

Histograms

Question 8

Graphical display of frequencies wherein each class frequency is plotted as a dot at the class midpoint, and the dots are connected by a series of time segments

Answer 8

frequency polygons

Question 9

A relatively simple statistical chart that is generally used to display continuous, quantitative data

Answer 9

Dot plots

Question 10

Provides a unique view of data

Answer 10

Stem-and-Leaf plots

Question 11

plotted along a numerical scale

Answer 11

Quantitative data graphs

Question 12

plotted using non-numerical categories

Answer 12

Qualitative data graphs

Question 13

a circular depiction of data where the area of the whole pie represents 100% of the data and slices of the pie represent a percentage breakdown of the sublevels

Answer 13

Pie charts

Question 14

contains two or more categories along one axis and a series of bars, one for each category, along the other axis

Answer 14

Bar graphs (horizontal)
Column charts (vertical)

Question 15

Column chart that displays the most common types of defects, ranked in order of occurrence from left to right

Answer 15

Pareto charts

Question 16

Importance of exploring relationship of two variables. A two-dimensional graph plot of pairs of points from two numerical variables.

Answer 16

Scatter plots

Question 17

3 TYPES OF CMT

Answer 17

Mode, Median, Mean

Question 18

most frequent occurring value in a set of data

Answer 18

Mode

Question 19

middle value in an ordered array of numbers

Answer 19

Median

Question 20

Formula of median

Answer 20

(n+1)/2

Question 21

average of a group of numbers computed by summing all numbers and dividing by the number of numbers

Answer 21

Mean

Question 22

Location of Percentile

Answer 22

i = P/100 (N)

Question 23

Measures of central tendency that divide a group of data into 100 parts

Answer 23

Percentiles

Question 24

Measures of central tendency that divide a group of data into four (4) subgroups or parts

Answer 24

Quartiles

Question 25

Describe the spread of the dispersion of a set of data

Answer 25

Measures of Variability

Question 26

The difference between the largest value of a dataset and the smallest value of a set

Answer 26

Range

Question 27

Range of values between the first and third quartile

Answer 27

Interquartile range

Question 28

average of the squared deviations about the arithmetic mean for a set of numbers

Answer 28

Variance

Question 29

square root of the variance

Answer 29

Standard Deviation

Question 30

What are the 3 measures of shape?

Answer 30

Skewness, Kurtosis, Box-and-Whisker plots

Question 31

lack of symmetry

Answer 31

Skewness

Question 32

Skewed left

Answer 32

negatively skewed

Question 33

Skewed right

Answer 33

positively skewed

Question 34

describes the amount of peakedness of a distribution

Answer 34

Kurtosis

Question 35

distributions that are high and thin

Answer 35

Leptokurtic

Question 36

distributions that are flat and spread

Answer 36

Platykurtic

Question 37

normal distributions

Answer 37

Mesokurtic

Question 38

a diagram that utilizes the upper and lower quartiles along with the median and the two most extreme values to depict a distribution graphically

Answer 38

Box-and-Whisker plots