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Activity- Frequency Distribution- Turtles
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Activity- Frequency Distribution- Turtles

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  • 1. Dr. Mark A. McGinley Texas Tech University BIOL 5311 Summer 2001 Activity Frequency Distributions- Turtle Ages
  • 2. Frequency distribution histograms
    • You have already had practice drawing a frequency distribution histogram graph
    • Now let’s try another example
  • 3. Graptemys versa Texas Map Turtle
    • Graptemys versa (Texas Map Turtles) are common in ponds in Texas
  • 4. Frequency Distributions sampling variation in traits
    • Biologists wanted to study the ages of turtles living in a pond near Lubbock
    • They caught all of the turtles in a pond and determines how old they were by looking at their shells.
  • 5. Here is what the data looked like Lubbock Age in years Number of turtles 1 5 2 10 3 15 4 10 5 5
  • 6. Frequency Distribution Lubbock Age of the turtle in years Number of individuals
  • 7. Analyzing the Graph
    • There is a lot of interesting information in this graph including
      • How many turtles of each age live in the pond
      • Youngest age (minimum)
      • Oldest age (maximum)
      • Range
        • The maximum age – the minimum age
      • What age is the most common
        • mode
  • 8. Look at the Graph and Answer These Questions
    • How many turtles are 1 year old?
    • How many turtles are 2 years old?
    • How many turtles are 3 years old?
    • How many turtles are 4 years old?
    • How many turtles are 5 years old?
    • How many turtles lived in the pond?
  • 9. Look at the Graph and Answer These Questions
    • How old are the youngest turtles in the pond?
    • How old are the oldest turtles in the pond?
    • What is the range of ages of turtles found in the pond?
    • What is the most common age for turtles?
  • 10. Turning Graphs Into Words
    • It is important to be able to turn information held in graphs into words.
    • Look at the graph you have just drawn and describe in a sentence or two what the graph tells us.
  • 11. Turn the graph into words
    • All of the turtles in the pond were between 1 and 5 years old. 5 turtles were 1 year old, 10 turtles were 2 years old, 15 turtles were 3 years old, 10 turtles were 4 years old, and 5 turtles were 5 years old.
  • 12. Use Math To Answer Some Questions
    • What percentage of turtles in the pond are 2 years old?
    • What fraction of turtles in the pond are 4 years old?
    • Turtles of which age make up the largest fraction of the turtles in the pond?
  • 13. New Study
    • Next the scientists were interested in comparing the ages of turtles living in a pond in Houston
    • They went to a pond in Houston, collected all of the turtles and determine their age
  • 14. Here is what the data looked like Houston Age in years Number of turtles 1 25 2 40 3 25 4 0 5 0
  • 15. Frequency Distribution Time!!
    • Draw the frequency distribution histogram for Houston .
  • 16. Frequency Distribution Houston Age of the turtle in years Number of individuals
  • 17. Look at the Graph and Answer These Questions About the Pond in Houston
    • How many turtles are 1 year old?
    • How many turtles are 2 years old?
    • How many turtles are 3 years old?
    • How many turtles are 4 years old?
    • How many turtles are 5 years old?
    • How many turtles lived in the pond?
  • 18. Look at the Graph and Answer These Questions About the Pond in Houston
    • How old are the youngest turtles in the pond?
    • How old are the oldest turtles in the pond?
    • What is the range of ages of turtles found in the pond?
    • What is the most common age for turtles in the pond?
  • 19. Turn the graph into words
    • All of the turtles in the pond were between 1 and 3 years old. 25 turtles were 1 year old, 40 turtles were 2 years old, 25 turtles were 3 years old.
    • There were more 2 year old turtles than there were either younger or older turtles.
  • 20. Comparing Ponds in Lubbock and Houston
    • The easiest way for biologists to compare what is happening in the pond in Lubbock with the pond in Houston is to look at the two graphs side by side.
  • 21. Comparing Two Graphs Number of individuals Age of turles in years Lubbock Houston
  • 22. Discuss The Differences Between the Two Frequency Distributions
    • What questions can you ask about the differences between the Lubbock and Houston populations?