1. Use a graphing calculator or technology to perform sinusoidal regression that will determine the sine function that best fits the data. Record the equation.
2. Choose a temperature (not a max or min temperature) and use the equation from part a) to find the months when the temperature is above your chosen temperature.
3. Choose a month when the temperature is changing at a negative rate. Determine the instantaneous rate of change of temperature at that point.

SAMPLE:

• All sunrise and sunset data are taken from the first day of each month.
• All times have been converted to hours using decimal values: i.e. 5 hr 45 min = 5 + 45/60 = 5.75 hrs.
• Daylight hours are the difference between sunset time and sunrise time.
• Temperature is the average monthly temperature.
• DATA: