Compute Probabilities of a Poisson Random Variable

question 91

Multiple Choice

Compute Probabilities of a Poisson Random Variable
-The number of traffic accidents that occur on a particular stretch of road during a month follows a Poisson distribution with a mean of 8.9. Find the probability that less than three accidents will occur next month on this stretch of road.

• A) 0.006752
• B) 0.022777
• C) 0.993248
• D) 0.977223

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Definitions:

Internal Consistency

The degree of reliability within a test—the extent to which different parts of the same test yield the same results.

Split-Half Reliability

A measure of internal consistency, often ascertained by comparing responses on odd-numbered test items with responses on even-numbered test items and seeing if the scores for these responses are correlated.

Coefficient Alpha

A method for evaluating internal consistency, calculated by averaging the intercorrelations of all the items on a given test. The higher the coefficient alpha, the higher the internal consistency.