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Unformatted text preview: MAT 194 Project 4 Precalculus Daylight and SAD 1 Daylight and Seasonal Affective Disorder (SAD) Background The seasons affect everyones moods to some degree, but some people are so strongly affected by the amount of daylight that they experience mild to severe depression during the part of the year when the hours of daylight are shortest. This condition is termed seasonal affective disorder, or SAD. A typical person with SAD feels depressed for two or three months, sometime between the end of October and late February. She (women are affected more often than men) may experience a lack of energy and a craving for carbohydrates, and she may respond by oversleeping, overeating, and withdrawing from society. An estimated 6% to 8% of the population of New England suffers from full-blown SAD. Unlike the traditional treatments for other forms of depression, an effective therapy for SAD has the patient sit in front of bright lights every morning. More information on SAD can be found at: http://www.ncpamd.com/seasonal.htm In this lab, you will find a function that can be used to estimate the amount of daylight that a person with SAD might be missing when compared to March 21, the first day of spring. An equinox occurs twice each year at two specific moments in time when the center of the sun is located vertically above the earths equator. This happens around March 20 or 21 and around September 22 or 23 each year. The word equinox comes from the Latin words for equal and night because at the equinox the night and the day are equally long. Your functions will depend on how far north of the equator you are! You will use your functions to estimate the rate at which the amount of daylight is changing at various times of the year. Note: Bring with you the cable that came with your calculator. This will be used to get the data from your instructors calculator. MAT 194 Project 4 Precalculus Daylight and SAD 2 Lab Preparation Before coming to the lab, you should make yourself familiar with the graph of the sine function. Before coming to the lab, you should make yourself familiar with the graph of the sine function....
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This note was uploaded on 12/21/2011 for the course MAT 194 taught by Professor Staff during the Fall '08 term at Syracuse.
- Fall '08