Sunday, 2 August 2015

trigonometry - Fitting data with Cosine

So I'm trying to wrap my head about Graphing Cos and Sin but I have several questions about graphing. I know that the Formula is



Y=Asin(t±h)+K



where A is Amplitude , t is Period, h is horizontal shift, k is the mid line.




I have the following data...
enter image description here



I know for fact the following...



Highest Point =73



Lowest point =43



Amplitude =(7343)=30




Midline =(A/2+43)=30/2+43=58



Now the problem is putting all the information together...



y=15cos(t±h)+58



my question is figuring the Period and Horizontal shift?



I think t (period), is the number of cycles between 0 and 24 so it's 24/1




t=24/1=24



but the graph shrinks?



I'm having trouble understanding how to obtain t- period and h- horizontal shift.



Most of the graphs on the internet use 2π/(# of intervals).

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