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COUNTING POPULATIONS

COUNTING POPULATIONS. Estimations & Random Samples. What are the 3 biggest populations in this pond community?. ACTUAL COUNT. Each member of a population is counted one by one. Which population was easiest to count?. Why?. RANDOM SAMPLES. Make a GRID

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COUNTING POPULATIONS

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  1. COUNTING POPULATIONS Estimations & Random Samples

  2. What are the 3 biggest populations in this pond community?

  3. ACTUAL COUNT • Each member of a population is counted one by one

  4. Which population was easiest to count? Why?

  5. RANDOM SAMPLES • Make a GRID • Count the total number of squares in the grid • Choose one square of the grid at random. • Count the population in that one square. • Estimate the total population by multiplying the number in one square time the total squares in the grid.

  6. RANDOM SAMPLES

  7. ACCURACY??? Scientists help prevent over- and under-estimation by taking several samples and averaging the results.

  8. QUESTIONS • Why is a sample a good way to count a population? • What are some disadvantages to using a sample? • What could you do to sample a population of animals that do not stay in one place?

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