Ch 2

Question 1

raw data

Answer 1

data recorded in the sequence in which they are collected and before they are processed or ranked

Question 2

frequency distribution of a qualitative variable

Answer 2

lists all categories and the number of elements that belong to each category

Question 3

bar graph

Answer 3

a graph made of bars whos heights represent the frequencies of respective categories

Question 4

pie chart

Answer 4

a circle divided into portions that represent the relative frequencies of a population or sample belonging to different categories

Question 5

frequency distribution of quantitative date

Answer 5

lists all the classes and the number of values which belong to each class

Question 6

grouped data

Answer 6

data presented in the form of a frequency distribution

Question 7

class boundary

Answer 7

given by the midpoint of the upper limit of one class and the lower limit of the next calss

Question 8

cumulative frequency distribution

Answer 8

gives the total number of values that fall below the upper boundary of each class

Question 9

histogram

Answer 9

a graph ini which classes are marekd on the horizontal axis and the frequencies, relative frequencies or percentages are marked on the vertical axis

Question 10

polygon

Answer 10

a graph formed by joining the midpoints of the tops of succesive bars in a histogram with straight lines

Question 11

frequency curve

Answer 11

for a large dataset, as the number of classes increases, the frequency polygon eventually becomes a smooth curve