Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Sampling
A Population is a collection of all the data points being studied. For example, if we are studying the annual incomes of all the people in India, then the population under study would consist of data points representing the incomes of each and every person in India.
A Sample is a part of a population.
In the above example the following would be some possible samples:
The annual incomes of all the people in Mumbai.
The annual incomes of all the people in India over forty years of age.
Your own annual income (assuming you are in India).
The annual incomes of the first hundred people mentioned in your telephone directory.
Samples, being smaller in size than their population, are easier to study. Hence, if we want to draw some conclusions about a population, we can do so by studying a suitable sample of the population.
Example
In which of the following cases do the samples appear to be suitable for arriving at conclusions about the corresponding populations?
1.
Population
:
Annual income of every person in India.
Sample
Annual income of randomly selected persons in Mumbai.
Answer
Not a representative sample because it is Mumbai.
2.
Likely customers for an exclusive credit card scheme.
Regular commuters on public transport buses.
May not be a representative sample because regular commuters on public transport buses may not be in the income range high enough to support an exclusive credit card holding.
The following notations are used to denote population parameters and sample statistics.
Characteristic
Parameter
Statistic
Size
Mean
Standard Deviation
Proportion
N
μ
σ
p
n
S
Q. 1 a) Describe the important quantitative techniques used in public system management. (10) b) Do you think the day will come when all decisions are made with the assistance of
Importance of official statistic
For calculating the mode of the grouped data graphically, the following procedure is adopted. Draw a histogram of the data; the modal class is the tallest rectangle.
Meaning and Definitions of Regression The dictionary meaning of regression is just opposite the meaning of progression. Progression means to move forward while regression means
What is an interaction? Describe an example and identify the variables within your population (work, social, academic, etc.) for which you might expect interactions?
How vital statistics are affects on our human life
Ask 3. Precision Manufacturing has a government contract to produce stainless steel rods for use in military aircraft. Each rod is required to be 20 millimeters in diameter. Each
Meaning and Definitions of Business Forecasting The problem of business forecasting refers to the analysis of the past and present economic conditions. With the objectiv
what is the aim of statistics?
a b c d e supply p 3 4 6 8 8 20 q 2 6 0 5 8 30 r 7 11 20 40 3 15 s 1 0 9 14 6 13 d 15 3 12 10 20
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd