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Asked Jan 7, 2020
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Explain the difference between the quantities Σxi yi and (Σxi )(Σyi ). Provide an example to show that, in general, those two quantities are unequal.

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Expert Answer

Step 1

For Σxi yi, first product the observations, xi and yi and then add the product values of xi×yi.

For (Σxi )(Σyi ), first add the observations of xi and yi seperately. then multiply sum value obtained for xi and yi.

Step 2

Consider the observations x...

Statistics homework question answer, step 2, image 1
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