• shreeradha
• Stats And Maths
• January 3, 2008
• 0 Comments

stats 7

Sampling error:
Sampling errors are the errors in the sample selection which can lead to incorrect results. Sampling errors are broadly classified as random errors, error to due bias or systematic errors.

Random Error.
All measurements are subject to error, which can often be broken down into two components: a bias or systematic error, which affects all measurements the same way; and a random error, which is in general different each time a measurement is made, and behaves like a number drawn with replacement from a box of numbered tickets whose average is zero.

Systematic error.

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• Maths And Stats
• January 3, 2008
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stats6

Sample Size:
The number of elements in a sample is called as sample size.

Sample Survey:
A survey based on the responses of a sample of individuals, rather than the entire population.

Cluster Sample.
In a cluster sample, the entire population is divided into heterogeneous group and some of such groups are selected as sample which is chosen on geographical basis is example of cluster sampling. If the blocks are chosen separately from different strata, so the overall design is a stratified cluster sample.

Convenience Sample.

• shreeradha
• Stats And Maths
• January 3, 2008
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stats 5

Data or Data Set
Data is a set of measurements of some qualitative aspect or quantitative aspect. If we record earnings of five persons in a city, say 100, 200, 200, 500, 1000 (in Rs) then those figures will be our data set or data.

Unit
Unit is an individual about which data is to be collected. e.g Person.

Observation
Observation is individual measurement in a data set. e.g Rs. 700

Quantitative Data
Quantitative data is data which has numerical value e.g. the above data. Another example is marks obtained by students in a class.

Qualitative Data

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• Stats And Maths
• January 3, 2008
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stats 4

(While compiling this book I have made use of royalty free information available on the net. However at many places I have put it in much simpler language to make the concepts easier to understand. Again examples are incorporated. Thus this work is not totally original yet a lot of value addition is gone into the basic input.)

1.4 Common Statistical Terminology

Frequency
Number of times the observation repeats is called as frequency of that observation. In our example frequency of observation 200 is 2 while frequency of other observations is 1 each.

Class

• shreeradha
• Maths Stats
• January 2, 2008
• 1 Comments

Now a write up on stats 3

Inferential statistics helps us in decision making process. Can we decide whether the cement blocks have the required strength from the given test results? Yes or No ?

• shreeradha
• Maths Stats
• January 2, 2008
• 0 Comments

Now a write up on stats 2

1.2 Statistical Modeling and Business Statistics for Decision Making.

Statistics can be broadly divided into two categories –
1. Descriptive Statistics
2. Inferential Statistics

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• Maths Stats
• January 2, 2008
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Now a write up on stats I

CHAPTER 1
What is Statistics?

1.1 Introduction.

In our day to day life we deal a lot with statistics, maybe without being aware of it. For example, when you tell your graduation marks – You are making use of ‘Averaging’ concept of statistics. When you talk of odds in favor of India’s winning a cricket match – You are dealing with ‘Probability’. When you are talking of most selling product – You speak of ‘Modal Value’. Weather forecast is also based on statistical analysis of weather conditions collected with the help of Satellite.

• shreeradha
• Heart
• Love
• January 1, 2008
• 0 Comments

Desolate Heart

This poem depicts the state of a lover whose beloved has departed and not returning back. But out of the love, lover refuses to accept the situation.
Through this poem the lover is trying to get the consolation through thinking that the beloved is not away, it is the problem in the eyes because of which beloved’s presence cannot be spotted out! And that tears are there to makes the eyes clean so that beloved can be seen.

Desolate heart trying to find consolation

That there could my eyes

Suffering from some disease

Could not spot your sight!

Faint eyes trying for your sight

• shreeradha
• January 1, 2008
• 1 Comments

Shrikrishna

Shri Krishna as all of us know is one of the divine personalities which gripped mind of hindus for years over years.

See the beautiful picture which is widely available at the following link. This picture is edited in a picture editor – photo shop.

http://www.shreeradha.com/images/krishna21.jpg

The essential difference between shree krishna and other avatars is that of expression of love. Shri Krishna has lovely appearance. The magic music of the flute always attracted all living beings of Gokul, Vrindavan and Barasana.