The Length of Time It Takes to Get Through the Security

question 72

Multiple Choice

The length of time it takes to get through the security checks at a very large urban airport is a random variable with a mean of  = 20.6 minutes and a standard deviation of  = 8.4 minutes.A simple random sample of 36 airline passengers is to be observed going through security.What is the mean of the sampling distribution of the sample mean ?

• A)8.4 minutes
• B)20.6 minutes
• C)1.4 minute
• D)It is close to 20.6 minutes,but we can't be certain without having the data to determine it.
• E)Without knowing the distribution,we don't know what it will be.

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Definitions:

Absolute Threshold

The minimum intensity of a stimulus that one can detect 50 percent of the time, a concept fundamental in sensory and perception studies.

Difference Threshold

The minimum difference in stimulation that a person can detect 50 percent of the time.

Relative Magnitude

The comparison of the size, extent, or importance of something in relation to another.

Difference Threshold

The least variation in stimulation that an individual is able to recognize 50% of the occasions, commonly termed as the just noticeable difference (JND).