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Cumulative frequency is the sum of frequencies of all classes less than and equal to a particular class.
Cumulative frequency of a class = sum of frequencies of previous classes + frequency of selected class
b) Ogive is a graph used to depict the cumulative frequency of a variable.
d) To assess the relationship between two variables, we use correlation.
Correlation measures the strength and direction of the relationship between 2 variables.
For the two variables, sales of companies and no. of employees, the correlation is -0.2357
(Correlation has been calculated in excel using the function '=CORREL(array1:array2)' )
Since the correlation is negative, it means that there is an inverse relationship between the two variables i.e. as one variable increases, the other decreases and vice versa.
A correlation of -0.2357 is not that high; it indicates that the relationship between the two variables is moderate or not strong.