# Understanding Graphs

Understanding Graphs

 Graph 1: Rabbits Over Time a. The graph shows a __________ growth curve. b. The carrying capacity for rabbits is ______ c. During which month were the rabbits in exponential growth? Graph 2: Average Toe Length a. In 1800, about how many people surveyed had a 3 cm toe? _______ How many in 2000? _______ b. The data shows the ____________ selection has occurred? c. In 2000, what is the average toe length? ______ What is the average toe length in 1800 _______? Graph 3: Mexico and US a. In Mexico, what percentage of the population is between 0-4 years of age? _______ In the US? ______ b. Which population is growing the fastest? ________ c. Which age group has the smallest number in both countries? _____

Chart 4: Trapping Geese

In order to estimate the population of geese in Northern Wisconsin, ecologists marked 10 geese and then released them back into the population. Over a 6 year period, geese were trapped and their numbers recorded.

a. Use the formula to calculate the estimated number of geese in the area studied? _____________
b. This technique is called ____________ & ______________.
c. Supposing more of the geese found in the trap had the mark, would the estimated number of geese in the area be greater or lesser? _____

 Year Geese Trapped Number with Mark 1980 10 1 1981 15 1 1982 12 1 1983 8 0 1984 5 2 1985 10 1

Chart 5: Mushroom Plots

Another ecologist uses a different method to estimate the number of mushrooms in a forest. She plots a 10×10 area and randomly chooses 5 spots, where she counts the number of mushrooms in the plots and records them on the grid.

a. Calculate the number of mushrooms in the forest based on the grid data: _________________
b. This technique is called _______________

Chart 6: Snakes & Mice

The data shows populations of snake and mice found in an experimental field.

a. During which year was the mouse population at zero population growth? ______
b. What is the carrying capacity for snakes ? ______
c. What is the carrying capacity for mice? _____
d. What is the rate of growth (r) for mice during 1970? _____ During 1980? ______

 Year Snakes Mice born Mice died 1960 2 1000 200 1970 10 800 300 1980 30 400 500 1990 15 600 550 2000 14 620 600 2001 15 640 580