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Preeti Dabral 1 year, 8 months ago
The properties of Karl Pearson’s Coefficient of Correlation are:
- Karl Pearson’s Correlation coefficient r has no unit. It is a pure number. It means a unit of measurement is not a part of r. It is independent of the origin and scale.
- The value of the correlation coefficient lies between {tex}- 1 \leq r \leq 1{/tex}. If the value of r lies outside this range, it indicates there is some error in the calculation.
- A negative value of r indicates an inverse relation. A change in one variable is associated with change in the other variable in the opposite direction.
- If r is positive it indicates a direct relation and the two variables move in the same direction.
- The converse of the theorem,i.e.,r=0, is not true, that is uncorrelated variables and need not necessarily be independent. Uncorrelation between the variables X and Y simply imply the absence of a linear relationship between them.
- Therefore, if the data is too large, step deviation method is used, which makes the calculation of correlation coefficient easy.
Posted by Shreya Agarwal 1 year, 8 months ago
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Preeti Dabral 1 year, 8 months ago
Inferential statistics use measurements from the sample of subjects in the experiment to compare the treatment groups and make generalizations about the larger population of subjects. There are many types of inferential statistics and each is appropriate for a specific research design and sample characteristics.
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Preeti Dabral 1 year, 8 months ago
Reasonable accuracy: The mathematical conclusion must be accurate based on the purpose of the investigation, its nature, size and available resources.
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Preeti Dabral 1 year, 8 months ago
Leftward shift of demand curve means decrease in demand. This is caused due to changes in any factor other than the price of its own commodity.
The leftward shift can occur due to the following reasons: -
(i) Decrease in price of substitute good - When there is a decrease in the price of substitute goods, the consumers will start demanding more of the substitue good, as a result demand for our good falls.
For eg. With decrease in price of substitute good (say coffee), demand for the given commodity (say tea) will decrease because the consumer will like to substitute tea for coffee as coffee has become cheaper.
(ii) Increase in Price of complementary good: When price of complementary good (say petrol) rises, the demand for the given commodity (say car) will fall.
(iii) Decrease in the income of the consumer: A fall in income of the consumer will lead to a decrease in demand as there is a direct relationship between income and demand.
(iv) Change in taste: When taste of the consumer shifts against the commodity due to change in fashion or climate the demand of the good falls.
(v) Expectation of future decrease in price: If the consumer expects a fall in the price of a particular commodity in the near future, then he would like to buy lesser quantity of the good.
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Preeti Dabral 1 year, 8 months ago
Say, for example, at the price of $5 per hot dog, consumers buy two hot dogs per day; the quantity demanded is two. If vendors decide to increase the price of a hot dog to $6, then consumers only purchase one hot dog per day.
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Preeti Dabral 1 year, 8 months ago
It refers to a system which provides means to earn livelihood.
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Khanak Gupta 1 year, 5 months ago
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