A Statistics Professor Receives an Average of Five E-Mail Messages

question 1

Multiple Choice

A statistics professor receives an average of five e-mail messages per day from students. Assume the number of messages approximates a Poisson distribution. What is the probability that on a randomly selected day she will have two messages?

• A)0.0067
• B)0.0014
• C)0.4200
• D)0.0842

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Definitions:

Population Proportion

The fraction or percentage of members in a population that exhibit a particular trait or characteristic.

Confidence Level

The percentage of times that a confidence interval, if repeated from multiple samples, would encompass the true population parameter.

Population Parameter

A numerical value that represents a characteristic of an entire population, such as mean or variance.

Sample Size

The number of subjects or units selected from a population to be studied in a statistical sample.