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
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
If the data set contains an odd number of items, the middle item of the array is the median. If there is an even number of items, the median is the average of the two items. If the
merits and demerits of methods to determin trends
The median, as the name suggests, is the middle value of a series arranged in any of the orders of magnitude i.e. ascending or descending order. As distinct from the arithmetic
how much that cost ?
Skewness Meaning and Definition Literal meaning of skewness is lack of symmetry; it is a numerical measure which reveals asymmetry of a statistical series. According t
prove that coefficient of correlation lies between -1 and+1
Analysis of Variance for the data: Draw a random sample of size 25 from the following data : (a) With Replacement and (b) Without Replacement and obtain Mean and Varia
Q. Find the inverse Laplace transform of Y (s) = s-4/s 2 + 4s + 13 +3s+5/s 2 - 2s -3. Q. Use the Laplace transform to solve the initial value problem y''+ y = cos(3t), y(0) =
Now, let's look at a different linear combination. Suppose we are interested n comparing the average mean log income for no college education ( 16). 1. Write out the linear com
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd