Chapter 2

Question 1

Smallest numbers that can actually belong to different classes

Answer 1

Lower class limit

Question 2

Largest numbers that can actually belong to different classes

Answer 2

Upper class limit

Question 3

Numbers used to separate classes but without gaps created by class limit

Answer 3

Class boundaries

The first lower class limit ناقص نص - Last upper class limit زائد نص

Question 4

The difference between two lower class limits

Answer 4

Class width

ننقص الاول بالاول اللي تحته

Question 5

Lower class limit + Upper class limit divided by two

The value in the middle of the classes

Answer 5

Class midpoints

Question 6

Reasons why constructing frequency distribution:

Answer 6

• Large data can be summarized

Question 7

To determine the range and class width if the given are only numbers without the table

Answer 7

• Determine the range ( maximum - minimum)
• Divide the range by the number of classes to get the class width
• طلع لك عدد تقريبي ؟ قربيه لاكبر عدد
• اكتبي الكلاسس من اصغر واحد وزيدي ٩ او الكلاس ودث الى the lower class ونقصي منه عشان تطلعي الابر حق الاول

Question 8

How to find the cumulative and relative frequencies?

Answer 8

Relative : Divide the class frequency by the sum of all the frequencies

Cumulative : نجمع الفركونسي اللي فوق باللي تحت

Question 9

How to find the percentage frequency?

Answer 9

Divide class frequency by the total the frequencies and multiply it with 100 to get the percentage

Question 10

Horizontal scale = classes of quantitative data
Vertical scale = frequencies

Answer 10

Histogram

Question 11

The horizontal scale of the histogram represents:

Answer 11

• Class midpoints
• Class boundaries
• Lower class limits

Question 12

Relative frequency histogram

Answer 12

The vertical scale is marked with relative frequency instead of actual frequencies

Question 13

What’s the shape of lines connected to points directly above midpoint class?

Answer 13

Frequency polygon

Question 14

Line graph that depicts cumulative frequencies

Answer 14

Ogive

Question 15

Graph which each data value is plotted as a point

Answer 15

Dot plot

Question 16

Bars of equal width to show frequencies of qualitative data

Answer 16

Bar graph

Question 17

Have two or more sets of bars to compare data

Answer 17

Multiple bar graph

Question 18

Bar graph for qualitative data with bars arranged in descending order according to the frequencies

Answer 18

Pareto chart

Question 19

Graph to depict qualitative data as slices of a circle

Answer 19

Pie chart

Question 20

A plot of paired data

Answer 20

Scatter plot

Question 21

Data that have been collected at different points in time

Answer 21

Time series graph