Test 2- Chapter 3 and 4

Question 1

Relative Frequency

Answer 1

Proportion/Percentage of the data values that fall in that category
= frequency in category
———————————-
total frequency

Question 2

Cumulative Frequency

Answer 2

Number of data values in that category and all preceding categories

Question 3

Bar Graph - Qualitative or Quantitative

Answer 3

Qualitative

Question 4

Pareto Chart

Answer 4

Bar graph that is arranged in frequency order

Question 5

Pie Chart -Qualitative or Quantitative

Answer 5

Qualitative

Question 6

Histogram

Answer 6

Graph in which the bars have a natural order and the bar widths have specific meaning

Question 7

Stem-and-Leaf plot (Stemplot)

Answer 7

Looks somewhat like a histogram turned sideways
Instead of bars is a listing of data for each category

Question 8

Histogram- Qualitative or Quantitative

Answer 8

Quantitative

Question 9

Line charts

Answer 9

Series of dots connected by lines

Question 10

Line charts- Qualitative or Quantitative

Answer 10

Quantitative

Question 11

Mean

Answer 11

sum of values/total number of values

Question 12

Median

Answer 12

Middle value

Question 13

Mode

Answer 13

Most common value(s)

Question 14

Outliers

Answer 14

Value that is much higher or lower than almost all others
Affects mean

Question 15

Weighted mean

Answer 15

Accounts for variations in the relative importance of data values
Each data value is assigned a weight
weighted mean= sum of (each data value x its weight)/sum of all weight
Ex.: (75x20)+(80x40)+(85x40)
————————————— =
20+40+60
81
——- = 81%
100

Question 16

Number of modes

Answer 16

1- Unimodal distribution
2- Bimodal distribution
3- Trimodal distribution

Question 17

Skewness

Answer 17

outliers in beginning/low outliers= left-skewed
outliers at end/high outliers= right-skewed
mode/median/mode all equal= symmetric

Question 18

Variation

Answer 18

Go high in small space= low variation
Not to high/low over mid space= moderate variation
Low over long space= High variation

Question 19

Range

Answer 19

Difference btw highest and lowest data values
= Max-Min

Question 20

Quartiles

Answer 20

Lower Quartile/Q1= 25th
Median/Q2= 50th
Upper Quartile/Q3= 75th

Question 22

5-Number Summary

Answer 22

lowest value
lower quartile
median
upper quartile
highest value

Question 23

Percentiles

Answer 23

= number of values less than this data value
—————————————— x100
total number of values in data set

Question 24

Standard Deviation

Answer 24

total number of data values - 1
then have to square root

deviation from mean= data value-mean