Dorothy Little Purchased a Mailing List of 2,000 Names and Addresses

question 4

Multiple Choice

Dorothy Little purchased a mailing list of 2,000 names and addresses for her mail order business, but after scanning the list she doubts the authenticity of the list.She randomly selects five names from the list for validation.If 40% of the names on the list are non-authentic, and x is the number of non-authentic names in her sample, P(x=0) is ______________.

• A)0.8154
• B)0.0467
• C)0.0778
• D)0.4000
• E)0.5000

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Definitions:

Z-statistic

A statistic used to determine the difference between an observed statistic and its hypothesized population parameter, measured in units of the standard deviation.

Two-tailed Test

A statistical test hypothesis that allows for the possibility of an effect in two directions, either greater than or less than.

Significant

In statistics, indicating that the results of an analysis are unlikely to have occurred purely by chance, at a specified level of probability.

Z-test

A method of statistical analysis that evaluates whether there is a significant difference between the means of two populations, given known variances and a large sample size.