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A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster. Use the definitions of X1 and X2 as given in the table. Consequently, D = X1-X2. Use the following to answer questions  A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster. Use the definitions of X<sub>1</sub> and X<sub>2</sub> as given in the table. Consequently, D = X<sub>1</sub>-X<sub>2</sub>.   -Compute the standard deviation of the differences. A)  0.84 B)  0.78 C)  0.13 D)  0.11
-Compute the standard deviation of the differences.


Definitions:

Cardiac

Pertaining to the heart and its associated functions in the circulatory system.

Hypotonic Intravenous Solution

An IV solution with a lower concentration of solutes than the blood plasma, used to hydrate cells by moving water into the cell.

Sodium Chloride

Common table salt, a compound consisting of sodium and chloride ions, used in food and as an electrolyte in medical solutions.

Lactated Ringer's

A solution used in intravenous therapy to replenish body fluids, supply electrolytes, and provide a source of lactate in various medical situations.

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