2.1 frequency distributions and charts

Question 1

frequency distribution

Answer 1

shows how many observations in each category

Question 2

relative frequency aka proportion

Answer 2

proportion of items that are in a particular category; equation: frequency/sum of all frequencies

Question 3

bar graph

Answer 3

heights of the rectabgles represnt frequencies/relative frequencies of the categories. relative is usually in decimals including the scales frequency is in whole numbers

Question 4

pareto chart

Answer 4

a bar grapgh that is useful to see clearly which are the most frequently occuring categories. the categories are presented in order of frequency or relative frequency

Question 5

hroizontal bars

Answer 5

bar grapgh that is horizontal, more convenient when categories have long names

Question 6

side-by-side bar graphs

Answer 6

used to compare the same categories so you construct them in the same axes with the same category next to each other

Question 7

pie charts

Answer 7

alternative to the bar grapgh; used to display relative frequency info. the relative sizes of sectors match their relative frequencyies of the catgory. If the catory has a relative freuqnecy of .22, the sector takes up 22% of the circle. usually expressed in percentages

Question 8

constructing pie charts

Answer 8

multiply the relarive frequency by 360 to find how big each sector should be

Question 9

frequency

Answer 9

the number of items that are in a particular catgory ina data set