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TABLE 7-7 Online Customer Service Is a Key Element to Successful Online

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TABLE 7-7
Online customer service is a key element to successful online retailing. According to a marketing survey, 37.5% of online customers take advantage of the online customer service. Random samples of 200 customers are selected.
-Referring to Table 7-7, the standard error of all possible sample proportions is ________.


Definitions:

Minimum Effect Concentration (MEC)

The lowest concentration of a drug that produces the desired therapeutic effect without causing adverse effects.

Toxic Level

The concentration of a substance in the body that can cause harmful effects or poisoning.

Plasma

The liquid component of blood, in which blood cells are suspended, consisting of water, salts, and proteins.

Iron Supplement

A dietary supplement used to increase the amount of iron in the body, often prescribed for anemia.

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