Two Sources of Waves, Call Them a and B, Send

question 69

Multiple Choice

Two sources of waves, call them A and B, send out waves across the surface of a lake. The waves from A have crests 1 cm high as measured from the normal undisturbed surface of the water. The waves from B are identical to those from A. How far is the water displaced at a point where a crest from A crosses a valley from B?

• A) 1 cm downward
• B) 1 cm upward
• C) 2 cm upward
• D) zero
• E) 2 cm downward

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Definitions:

Forecast Accuracy

The degree to which a forecast predicts actual outcomes.

Sum of Squares

A statistical technique used to measure the variation or dispersion of a set of values, by quantifying the summation of the squared differences between each value and the mean of the set.

Deseasonalized Time Series

A time series from which seasonal effects have been removed to analyze the underlying trend without seasonal variability.

Moving Averages

Moving averages are statistical measures used to analyze data points by creating a series of averages of different subsets of the full data set.