Test on Chapters 1 and 2, 9/30/2004

Statistics / Mr. Hansen
9/30/2004

Name: _________________________

Test on Chapters 1 and 2, First Portion

Time limit: 40 minutes (60 minutes for extended-time students). No calculator allowed.

Part I: Terminology (4 pts. each)

Write the name and the proper Greek or Roman symbol or abbreviation for each of the following. The first one (#1) does not count for credit but has been done for you as an example.

		Name	Standard Abbrev.
1.	Number of subjects in the entire population	Population size	N

2.	Number of subjects in a sample (i.e., the group that was actually polled or tested, as opposed to the entire population)	_____________ _____________ (2 words)	_____________

3.	The mean squared deviation from the mean, in an entire population (serves as a measure of dispersion)	_____________ _____________ (2 words)	_____________

4.	Square root of #3; also measures dispersion in a population, but has the advantage of being in the same units as the underlying data, instead of “square units”; used as one of the two parameters of a normal distribution; equals 1 for the standard normal distribution	_____________ _____________ _____________ (3 words)	_____________

5.	Same as #4, except for a sample	_____________ _____________ _____________ (3 words)	_____________

6.	Q₃ – Q₁	_____________ _____________ (2 or 3 words, depending on whether you split the first one)	_____________

7.	Arithmetic “average” (i.e., sum of observations divided by their count) in a sample	_____________ _____________ (2 words)	_____________

Part II: Essay (8 pts.)

Write complete sentences. Spelling, grammar, and punctuation count.

Describe how to determine whether an observation in a data set is an outlier, using the standard rule of thumb that we learned. Although you may use a specific data set as an illustrative example, that is not required. What is required is that your instructions are clear, complete, and general. In other words, they must apply to all possible situations. You may assume that your reader already knows standard statistics terminology (mean, mode, median, percentile, quartile, etc.).

This essay can be answered for full credit in about 2 or 3 sentences. However, I am providing you with a full page so that you do not feel pinched or constrained in any way.

[Remainder of test was taken from another source.]