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# Reading equations with variables in datasets

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#1 The equation,∑xi2 is best known as the
a) sum of all the squared values of the variable x in the dataset
b) product of all the values of the variable x in the dataset.
c) square of the sum of all the values of the variable x in the dataset
d) sum of all the values of the variable x in the dataset.

#2 The equation (∑xi)2 is the best known as the
a) sum of all the squared values of the variable x in the dataset
b) product of all the values of the variable x in the dataset.
c) square of the sum of all the values of the variable x in the dataset
d)sum of all the values of the variable x in the dataset.

#### Solution Preview

multiple choice concept review
#1 The equation,∑xi2 is best known as the
If you wrote out it would look like this: . By the order of operations specified by the rules of arithmetic you would square each individual value first and then add up the resulting squared values. Since the last operation that you would be performing is the addition, the whole thing is referred to as a sum ... a sum of ...

#### Solution Summary

The following posting helps with problems involving sums of squared values, products of values, and square of sums.

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