Stuart wants to study whether there is a relationship between the number of hours a high school senior spends on social networking sites and their grade point average. he obviously cannot study every 12th grader, so instead he will select a smaller of seniors to study.

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Explanation:

Stuart will have to use inferential statistics to study whether there is a relationship between the number of hours a high school senior spends on social networking sites and their grade point average.

Inferential statistics is used when it is not possible to use descriptive statistics. Descriptive statistics gives the relation between the recorded data only. Inferential statistics gives us the result after analysis of the sample data, from which the population data can be inferred.

Here, the population is the total number of seniors from which Stuart will take a small sample.

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explanation:

~kinetic ~potential

explanation:

kinetic and potential energies would be types of mechanical energies.