Descriptive statistics: Table and Graphic Methods

Descriptive statistics: Table and Graphic Methods

• Data can be classified into data types or data types.

  • Data of Different Types

    • Is the type used to mark or name the project to identify

  • Data Volume Data

    • Is the value of the number or size.

Classified Data Summary

• Frequency Distribution: indicates the number of items in each group in several non-overlapping groups, that is, the frequency of occurrence.

  • How to Use table and graph methods to collect data of the total score type

• Statistical results

Statistical result information: provides more content that is not visible to the original data. Who has the highest popularity and who has the lowest visibility?

Relative frequency distribution and percentage frequency distribution

• Relative frequency distribution

  • The relative frequency of a group is the proportion of the number of projects in the group.

  • For example, the relative frequency of Coca-Cola in 50 purchases = 19/50

• Percentage Frequency Distribution

  • Relative frequency * 100%

Bar Chart and pie chart

• Bar Chart: used to describe the frequency distribution, relative frequency distribution, or percentage frequency distribution of summarized data of different types (whether it is very difficult). Don't worry, see the figure, the official installation of forced words is not a complicated explanation of simple things

Summary:The bar chart is required first.SummaryRaw data, then the classification type is placed on the horizontal axis, the number of occurrences of the indulgence axis

• Pie Chart: It is another graphical method that depicts the relative frequency and percentage frequency distribution of data of different types.
  • Summarize and calculate the relative frequency
  • Relative frequency: * 360 °

Note: in actual life, there will be many categories of drinks, most of which only have a small number of purchases, most statistical experts suggest merging combinations with fewer frequencies into a comprehensive group called "Others". Groups with a frequency of 5% or fewer often do this.

Exercise

I,

Group	Relative frequency	Group	Relative frequency
A	0.22	C	0.40
B	0.18	D

A. What is the relative frequency of group D?

• 0.2 = 1-0.22-0.18-0.40

B. If the sample size is 200, What is the frequency of group D?

• X = 200*0.2 = 40

II,

DH	CSI	DH	CSI	L & O
Trace	CSI	L & O	Trace	CSI
CSI	DH	Trace	CSI	DH
L & O	L & O	L & O	CSI	DH
CSI	DH	DH	L & O	CSI
DH	Trace	CSI	Trace	DH
DH	CSI	CSI	L & O	CSI
L & O	CSI	Trace	Trace	DH
L & O	CSI	CSI	CSI	DH
CSI	DH	Trace	Trace	L & O

A. Are these data classified or quantitative?

• Shard type

B. Compile the frequency distribution and percentage frequency distribution of the data.

• Draw as follows

Group	Frequency	Frequency Distribution	Percentage frequency
DH	13	0.26	26%
Trace	9	0.18	18%
CSI	18	0.36	36%
L & O	10	0.10	10%

C. Create a bar chart and pie chart for the data.

• Bar Chart

• Pie Chart
  

D. Based on samples, which program has the most TV viewers? Which of the following ranks second?

• CIS first, DH second

Descriptive statistics: Table and Graphic Methods