I for a Normal Probability Distribution, About 95 Percent of the Area

question 85

Multiple Choice

i. For a normal probability distribution, about 95 percent of the area under normal curve is within
Plus and minus two standard deviations of the mean and practically all (99.73 percent) of the area
Under the normal curve is within three standard deviations of the mean.
ii. The total area under the normal curve is 100%.
iii. The mean of a normal probability distribution is 500 and the standard deviation is 10.
About 95 percent of the observations lie between 480 and 520.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) is a correct statement but not (ii) or (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (i) and (ii) are correct statements but not (iii).
• E) (i), (ii), and (iii) are all false statements.

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Definitions:

Online Communities

Virtual platforms or networks where individuals with shared interests or goals gather to communicate, share information, and foster relationships without geographical constraints.

Netnography

A research methodology that adapts ethnographic techniques to study the cultures and communities that emerge through the internet.

Sampling Types

Different methodologies used in statistical analysis for selecting a subset of individuals or items from a population to estimate characteristics of the whole population.

Probability

The measure of the likelihood that an event will occur, expressed as a number between 0 and 1, where 0 indicates impossibility and 1 indicates certainty.