test #2-graphing and summarizing data

Question 1

what is a bar graph

Answer 1

-vertical/horizontal.
- for categorical data
-bars separated by space

Question 2

what is a Pareto chart

Answer 2

• same as bar graph but in increasing or decreasing order.

Question 3

a complete frequency distribution table contains;

Answer 3

values, frequency, relative frequency and cumulative frequency

Question 4

what is relative frequency

Answer 4

1/19, 9/19, 4/19…

Question 5

what is a grouped frequency distribution table

Answer 5

-organizes grouped data
-5 to 20 groups is ideal
-calculate class width for classes

Question 6

difference between discrete or continuous data in a table

Answer 6

discrete; x-y
continuous; [x,y[

Question 7

what is a histogram

Answer 7

-only for continuous data
- similar to a bar graph, but the bars are side by side.
-different bars are the different classes

Question 8

what is a frequency polygon

Answer 8

only for grouped data
made by joining the mid values of the groups

Question 9

what is a cumulative frequency polygon

Answer 9

only for grouped data
requires the upper bound of each class

Question 10

how can you find the upper bound for discrete data.

Answer 10

x-y
UB: y.5

Question 11

how can you find the upper bound for continuous data

Answer 11

[x,y[
UB: y

Question 12

what is a stem and leaf plot

Answer 12

represents data by splitting each value into a stem (first digit) and leaf (las digit(s))

Question 13

why do we use measures of central tendency

Answer 13

to identify what is normal for a data set

Question 14

what is the mean

Answer 14

the average
it is very outlier sensitive.

Question 15

what is the median

Answer 15

the middle value
values have to be placed in increasing or decreasing order
not outlier sensitive

Question 16

what is the mode

Answer 16

the most frequent

Question 17

how do you find the median and mode for groupe data

Answer 17

medial class and grouped data

Question 18

what are measures of dispersion

Answer 18

it describes how spread out or dispersed the data is

Question 19

what is the range

Answer 19

the difference between the lowest and the highest values. [min,max]

Question 20

what is standard deviation

Answer 20

a useful measure of how much the data values deviate from the mean root variance

Question 21

what is variance

Answer 21

the average of the square differences from the mean (standard deviation) exp2

Question 22

when do you use sx vs ox for standard deviation

Answer 22

sx when the data set is less than 30 and ox when its greater than 30

Question 23

what are measures of position

Answer 23

the location of data values relative to other values in the same data set

Question 24

how can you find outliers

Answer 24

a value is < Q1-1.5(IQR)
a value is > Q3-1.5(IQR)