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Showing posts with the label BUSINESS STATISTICS

Difference between Correlation and Regression.

 Correlation                                                     Regression 1.It shows the relationship between two variables.1.It measures the relationship between two variables. 2.Both the variables are random variables.      2.Both the variables may or may not random variables. 3.It shows the degree of relationship between two variables.3.It shows the cause and effect relationship between two variables. 4.It provides limited information.                       4.It provides more information. 5.If we know the value of one variable the value of other variable can not be estimated.4.If we know the value of one variable the value of other variable can be estimated. 6.It shows the nature of linear relationship.          6.It shows the impact of the indep...

Regression analysis its Utility and limitation.

 Regression analysis is a statistical technique to use to predict the value of one variable after the using the value of other variable.It is a mathematical model of the measuring average relationship between two or more than two variable. There are two types of Regression.One is simple regression and second is multiple regression. 1.Simple regression- It is the first type of regression. The process of estimating the mathematical relationship between a dependent variable and an independent variable this process is called simple regression. The dependent variable usually called y and the independent variable is called x. 2.Multiple regression- It is the second type of regression.The regression that explain the relationship between multiple independent variable and one dependent variable this type of regression is called multiple regression. Use of regression- 1.It formulates the functional relationship between two and more than two variables. 2.It determines the functional relations...

Difference between Primary and Secondary Data

 There are many differences between Primary and Secondary Data. These differences are as below- Primary Data                                                     Secondary Data 1.It is collected by Researcher at first time.     1.It is collected by any other person. 2.It is current data.                                            2.It is not current data. 3.It consists many steps.                                   3.It does not consist many steps. 4.It is costly.                                                  ...

Primary Data

 Data is the collection of facts, figure, images. There is two types of Data. One is primary data and second is Secondary Data. Primary Data- It is the first type of data. The data that is collected by Researcher at first time this type of data is called Primary data. In other words we can say that the data that is which is collected by Researcher under the supervision of of an investigator this type of data is called Primary data. Features of Primary data- There are many features of primary data. These features are as below- 1.It is fresh. 2.It is first hand data. 3.It is in original form. 4.It is current. 5.It belongs to our concern problem. 6.It is accurate. 7.It is subjective. Advantage- 1.It belongs to our problem so we may solve problem by an effective,efficient way. 2.Its interpretation is easy. 3.It maintains secrecy. 4.Researcher may better control at this type of data. 5.It is bias free so Researcher may maximum trust on it. 6.It is reliable. 7.It is up to date data so it...

Secondary Data

 There are many methods of Secondary Data collection. These methods are as below- 1.Census- It is the first method of Secondary data collection.Every government does census in his country after a fix period. This period may be five or ten years. In this process they collect many facts, figures of their citizens.They also collect data in questionnaires form.Researcher may take these data from Census department. Advantage- 1.It provides huge facts, figure. 2.It provides detail data. 3.It is error free. 4.It is easy to use. 5.It is beneficial if population size is big. Disadvantage- 1.It does not cover every topic. 2.It provides depth facts, figure so analysis is dificult. 3.It is carried out every ten years. 4.It is beneficial only economical area. 5.It takes long time to collect and process. 2.Government publication- It is the second method of data collection. Every government publishes many reports, paper, document every year.These reports contain many facts, figure, data etc. Rese...

Primary Data and its collection methods Advantage disadvantage.

There are two types of data. One is primary data and second is secondary data. Primary data- The data that is collected by researcher and present in original form this type of data is called primary data. Secondary data-The data that is not collected by researcher and it is presented earlier this type of data is called Secondary data. Methods of collection Primary data- There are many methods of collecting Primary data. These methods are as below- 1.Survey method- It is the first and simple method of primary data collection.The process in which Researcher goes to Respondent and records facts, figure that is given by respondent this process is called Survey. Advantage- 1.It is simple method. 2.It is less cost. 3.It may be conducted quickly. 4.It permits researcher to guide respondent. 5.It provides respondent enough time to think and reply. Disadvantage- 1.It is not useful if topic is controversial. 2.The true response of Respondent is less. 3.If Respondent is uneducated and noncooperat...

Graphical representation of Data

 There are many ways of representation of Data. These ways are numeric way and Graphic way. A graph is a sort if chart through which data are represented in many forms.There are many ways data is represented in graphical ways. These ways are Line diagram, Histogram, Bar diagram, Pie chart, Frequency Polygon and Ogive.  1.Line diagram- It is the first way of representation data. It is also simple way.When data vary over time we use line diagram to represent it.In a simple line gram we plot t and y form. t represents the time series at the time point.The plotted points are then joined by line segments. This process is called line diagram. 2.Histogram- It is the second methods of represent data.It is one of the most used methods for representing historical data. Advantage- 1.It is simple. 2.It is versatile. 3.It may used many condition. 4.It has multipurpose use. 5.It shows the spread of variations. So we can say that Histogram is a pictorial representation of data. 3.Bar graph- ...