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Number of Powerboats Registered vs. Number of Manatees Killed from 1977 to 1990

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Introduction

Number of Powerboats Registered vs. Number of Manatees Killed from 1977 to 1990 Year Number of Powerboats Registered (thousands) Number of Manatees Killed 1977 447 13 1978 460 21 1979 481 50 1980 498 16 1981 513 24 1982 513 20 1983 526 25 1984 559 34 1985 585 35 1986 614 33 1987 645 69 1988 675 43 1989 711 50 1990 719 55 Data table delineating records of Manatee deaths to Powerboat registrations which over the course of time portrays an increase of the number of deaths to registrations. The data seems to stay consisted over the years, which is better delineated by the scatter plot below. ...read more.

Middle

My R value is .969 which is significantly greater than .532 which comes from the degrees of freedom chart suggesting correlation and accuracy. The statistical evidence from the data table and the comparative scatter plot indicates that the death toll is correlated with the number of registered powerboats and will increase over the given number of years to come. Qualitative Observations * The trend line represents a gradual increase over the course of 23 years. * The number of Manatees killed drastically increases from 13 in 1977 to 55 in 1990 which indicates a continuing increase in deaths if it remains on this course. ...read more.

Conclusion

As the rate gradually increases already, supported by the scatter plot, there will soon be fewer manatees as a result of this problem. Other studies have been conducted to support these claims. "There have been at least 60 manatee deaths from watercraft collisions this year" (Collier 2009). This report comes from a study conducted every year by this society to monitor manatee deaths. Another finding made by Dr. Bruce Ackerman suggests that watercrafts are the single most lethal weapon against manatees. "The single greatest identifiable cause of death was collisions with watercraft."(Dr. Bruce Ackerman 2008). His findings indicate that at the rate of manatee deaths due to watercrafts the population will slowly diminish. ?? ?? ?? ?? 1 ...read more.

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