Sine Equation on TI

For this activity please refer to Portland Monthly Climate Summary Use the Average Max Temps. Average Max. Temperature (F) Jan 45.1 Feb 50.6 Mar 55.3 Apr 60.8 May 67.5 Jun 73.2 Jul 80 Aug 79.9 Sep 75 Oct 63.6 Nov 52.5 Dec 46

I. Entering Data

Press the STAT Key Press ENTER

Enter x values in L1 Enter y values in L2 If columns are not clear let me know. Enter x values in L1 Enter y values in L2

Data is now entered and saved on your calc. Press QUIT

II. PLOTING DATA

Press the STAT Key Press 2nd y= STAT PLOT

Make sure all the plots are off. Press ENTER

Use the arrow keys and enter key. Make sure the screen matches

ZOOM Choose 9: Zoomstat

III. Calculating the sine equation and graphing the equation.

Disclaimer: to apply the SinReg you must have several pairs of data, where the x values are equally spaced. At Home Screen Choose C

𝒔𝒐 𝒕𝒉𝒆 𝒎𝒐𝒅𝒆𝒍 𝒊𝒔: 𝒚=𝟏𝟔.𝟖∗ 𝐬𝐢𝐧 𝟎.𝟓𝒙−𝟐.𝟐 +𝟔𝟐.𝟕

The sine equation is stored in Y1. Press GRAPH

Predictions and such. User your Model: Predictions: What is the average maximum temperature on March 15? In some businesses, AC is turned on when temperature is above 68 degrees. For what time interval is the AC most likely to be turned on?

AC will be on from Approx. April 24th to Sept 15. On March 15, the temperature is approximately 56.6 degrees AC will be on from Approx. April 24th to Sept 15.

Repeat the process: A) Use Average Minimum temperatures; Don’t erase your other information: Use L1, L3, Plot 2 , Y2 B) Use Average Precipitation; Don’t erase your other information… but turn them off. Use L1, L4, Plot 3 , Y3

Homework Use the given data for: State a model for each city. Salt Lake City New York City Vancouver, Canada Buenos Aires, Argentina State a model for each city. According to the models, which city resembles Portland max. temp trend most closely?