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Class 9 (Correlation (explanation of example table (Example Table…
Class 9
Correlation
there is a correlation between zulm & na-insafi of house leader and happiness in house
our Religion says that take care of your parents
ALLAH says that your children will take care of you
As you sow so shall you reap
this is all correlation
everything is in relation with something else
correlation between exercise & good health
when you will do husn-e- sulook with your parents
then your children will do husn-e-sulook with you
this is correlation
and this is positive correlation
correlation in context of numbers
e.g student have no income but after getting job, he will have some income
there is a positive correlation between rise in income & standard of living/lifestyle
when income increases, poverty decreases
rise of income has 2 relationships simultaneously
standard of living increases
poverty decreases
over eating affects fitness badly. if someone does not do cross fitness(i.e. exercise etc.) then it will have negative effect
if someone gets sick then he/she have to take medicine.
if he/she gets well by taking the medicine then he/she will say that there is positive correlation of medicine
if he/she does not get well by taking the medicine then he/she will say that there is no impact of medicine, no correlation
if he/she becomes more sick after taking the medicine then he/she will say that there is negative correlation
r=correlation
r= +1......0......-1
its ratio
e.g A to B and B to A
e.g r=0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0
A and B positively responds each other. if one increases the other also increases
it can be in points as well as percentages
there is a correlation between teacher's lecture & student's understanding
sign shows the direction
number shows the magnitude
e.g r=+0.5 positive correlation
e.g r=-0.05 negative correlation
explanation of example table
Example Table
income increases, food expenditure increases means positive correlation
weight is correlated with this, it also increases means positive correlation
sleeping hours have negative correlation with this because with the increase in income, the person was having less time for sleep as he was involve in so many other different activities after getting rich
positive correlation with electronics because the number of mobile, computers,TV, laptops etc increased with increase in income
Religion is having negative correlation with this because with the increase in income, the person was giving less time to his Religion like prayers etc.
correlation just tells relation
it does not tell about the number i.e how much
correlation just tells about the phenomena among the variables
it tells about the relation among the variables that whether or not any relation exists between the variables
however, correlation will not define that which variable is responding to whom. it will not give idea about the direction that in which direction it is heading
correlation just explains the relation that whether or not 2 variables respond to each other. correlation does not tell that how much they respond and which variable responds to whom
Mathematical Models
Equation
2 parts i.e. R.H.S & L.H.S
e.g. Y=a+3B-2.5D+0.6N
alphabets are variables & are also called indicators which are 5 for this equation i.e. Y,a,B,D,N
numbers are constant and in this equation 4 constant i.e. 1,3,2.5,0.6 are present
signs in equation tells about the correlation i.e. whether it is positive or negative
we must pay attention to this thing that which variable is dependent on the other & which variable is independent
e.g. with the increase in income, standard of living (SOL) increases
if we pay close attention to this, the direction is like, with increase in income, the SOL will increase. it means SOL is dependent on income
Y=1a means positive, 1 time increase in a gives 1 time increase in Y
Y=3B means positive, 3 time increase in B results in 1 time increase in Y
huge change or increase in B i.e. 3 will result in 1 time increase in Y
Y=-2.5D means negative, 2.5 times decrease in D will give 1 time increase in Y
Y=0.6N means positive, 0.6 times increase in N will be giving 1 time increase in Y
just a minor change or increase in N i.e. 0.6 will give 1 time increase in Y
Economic Growth=2.5Education+1.5Electricity-0.5Terrorism
