QUESTION: 689

Which is true of a leptokurtic distribution?

It will be more peaked than the normal distribution.
II. It will have thinner tails than the normal distribution.
III. It will be less peaked than the normal distribution.
IV. It will have fatter tails than the normal distribution.
I and II.
I and IV.
III and II.
III and IV.

Answer(s): B

Explanation:

I and IV are true of leptokurtic distributions. This is also called having "excess kurtosis." II and III are characteristic of platykurtic distributions.

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QUESTION: 690

An experiment may have:

Two or more results
None of these answers
Only two results
Only one result

Answer(s): A

Explanation:

Experiments may have many outcomes.

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QUESTION: 691

A sample of the paramedical fees charged by clinics revealed these amounts: $55, $49, $50, $45, $52 and $55.
What is the median charge?

None of these answers
$51.00
$47.50
$52.00
$55.00

Answer(s): B

Explanation:

Order them: 45,49,50,52,55,55. The median is therefore (50 + 52)/2 = 51

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QUESTION: 692

A sample of 10 observations is drawn from a population with mean 17. The mean of the observations equals 14.3 and the sample standard deviation equals 4.8. The sampling error in mean equals ________.

9.6
-2.7
14.3
4.8

Answer(s): B

Explanation:

"Sampling error" refers to the difference between a sample statistic and the corresponding population parameter. In this case, the sampling error equals 14.3 - 17 = -2.7.

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QUESTION: 689

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QUESTION: 690

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QUESTION: 691

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QUESTION: 692

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