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Dr. Mark A. McGinley Texas Tech University BIOL 5311 Summer 2001 Activity Frequency Distributions- Turtle Ages
Frequency distribution histograms <ul><li>You have already had practice drawing a frequency distribution histogram graph  ...
Graptemys versa   Texas Map Turtle <ul><li>Graptemys versa  (Texas Map Turtles) are common in ponds in Texas </li></ul>
Frequency Distributions sampling variation in traits <ul><li>Biologists wanted to study the ages of turtles living in a po...
Here is what the data looked like Lubbock Age in years Number of turtles 1 5 2 10 3 15 4 10 5 5
Frequency Distribution Lubbock Age of the turtle in years Number of  individuals
Analyzing the Graph <ul><li>There is a lot of interesting information in this graph including </li></ul><ul><ul><li>How ma...
Look at the Graph and Answer These Questions <ul><li>How many turtles are 1 year old? </li></ul><ul><li>How many turtles a...
Look at the Graph and Answer These Questions <ul><li>How old are the youngest turtles in the pond? </li></ul><ul><li>How o...
Turning Graphs Into Words <ul><li>It is important to be able to turn information held in graphs into words. </li></ul><ul>...
Turn the graph into words <ul><li>All of the turtles in the pond were between 1 and 5 years old.  5 turtles were 1 year ol...
Use Math To Answer Some Questions <ul><li>What percentage of turtles in the pond are 2 years old? </li></ul><ul><li>What f...
New Study <ul><li>Next the scientists were interested in comparing the ages of turtles living in a pond in Houston </li></...
Here is what the data looked like Houston Age in years Number of turtles 1 25 2 40 3 25 4 0 5 0
Frequency Distribution Time!! <ul><li>Draw the frequency distribution histogram for Houston . </li></ul>
Frequency Distribution Houston Age of the turtle in years Number of  individuals
Look at the Graph and Answer These Questions About the Pond in Houston <ul><li>How many turtles are 1 year old? </li></ul>...
Look at the Graph and Answer These Questions About the Pond in Houston <ul><li>How old are the youngest turtles in the pon...
Turn the graph into words <ul><li>All of the turtles in the pond were between 1 and 3 years old.  25 turtles were 1 year o...
Comparing Ponds in Lubbock and Houston <ul><li>The easiest way for biologists to compare what is happening in the pond in ...
Comparing Two Graphs Number of individuals Age of turles in years Lubbock Houston
Discuss The Differences Between the Two Frequency Distributions <ul><li>What questions can you ask about the differences b...
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Activity- Frequency Distribution- Turtles

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Transcript of "Activity- Frequency Distribution- Turtles"

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