A Researcher Is Interested in Evaluating a Certain Brand of Radial

question 80

Short Answer

A researcher is interested in evaluating a certain brand of radial auto tire. Twenty tires are randomly selected from retail outlets throughout the country, and each is placed on a special machine which rotates the tires at a constant speed (equivalent to 55 miles per hour) against the friction equivalent of a 4000 pound auto being driven on a smooth highway. Each tire is run until there is no tread left. The number of miles (in thousands) were as follows: 40, 30, 32, 35, 39, 35, 31, 36, 37, 35, 34, 35, 37, 34, 36, 38, 35, 36, 35, 36.
-Find the estimated standard error of the mean.

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Definitions:

Sediments

Particles of rock, sand, or organic materials that are transported and deposited by wind, water, or ice, and that accumulate in layers on the Earth's surface.

Dissolved Substances

are materials that are incorporated into a liquid (usually water) in molecular, ionized or micro-granular (colloidal sol) form, making them parts of the solution.

Vertical Zones

The layers or strata of ecosystems, particularly in forests and oceans, characterized by distinct habitats, flora, and fauna.

Euphotic

Relating to the upper layer of a body of water through which sunlight can penetrate and support photosynthesis.