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Salmon Survival For reasons that are not yet fully understood, the number of fingerling salmon that survive the trip from their riverbed spawning grounds to the open ocean varies approximately sinusoidally from year to year. The table shows the number of salmon that hatch in a certain British Columbia creek and then make their way to the Strait of Georgia. The data are given in thousands of fingerlings, over a period of 16 years.
(a) Make a
(b) Find a sine curve that models the data (as in Example 1).
(c) Graph the function you found in part (b) together with the scatter plot.
(d) Use a graphing calculator to find the sine curve that best fits the data (as in Example 2). Compare to your answer from part (b).
Year | Salmon
|
Year | Salmon
|
1985 | 43 | 1993 | 56 |
1986 | 36 | 1994 | 63 |
1987 | 27 | 1995 | 57 |
1988 | 23 | 1996 | 50 |
1989 | 26 | 1997 | 44 |
1990 | 33 | 1998 | 38 |
1991 | 43 | 1999 | 30 |
1992 | 50 | 2000 | 22 |
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