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Name: January 30, 2001 Score:

MATH 147

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Quiz 1

(4 pts.)

Problem 1. Circle T for a true statement, F for a false statement.

T F For a list of numbers, approximately 50% are above the average.

T F In a histogram with a long right tail the median is smaller than the average.

T F When we assign subjects to the treatment group at random the experiment is called double-blind.

T F "Number of cars owned per household" is an example of a continuous quantitative variable.

(3 pts.)

Problem 3. For the following list of numbers compute the standard deviation, average, and median. You may round calculations to the hundredths place.

5, 3, -1, -4, 7

(3 pts.)

Problem 4. A study of daily coffee drinking habits in the math department yields the results below. How tall should the bar over the class interval 0-3 be? (Class intervals include the left endpoint, but not the right.)