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Chemistry LibreTexts

5.5: Exercises

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  • Behavioral and ecological factors influence dispersion. Uniform patterns of dispersion are generally a result of interactions between individuals like competition and territoriality.

    1. In ecology a uniform distribution of an organism may result when the organism exhibits territorial behavior that keeps most organisms. In one study, a portion of a field was divided into a \(20 \times \20\) grid and a count made of the number of organisms in each unit of the grid giving the results seen below.

    number of organisms in plot frequency
    2 58
    3 51
    4 60
    5 64
    6 54
    7 52
    8 61

    Create a plot similar to that in 5.4.1 and comment on your results.

    2. Chlorine has two isotopes, 35Cl (75.8% abundance) and 37Cl (24.2% abundance). Create a plot similar to that in Figure 5.4.2 for the molecule PCB 77, a chlorinated compound with the formula C12H6Cl4 and comment on your results.

    3. A radioactive decay process has a background level of 3 emissions per minute and follows a Poisson distribution. The number of emissions per minute was monitored for one hour giving the following results

    emissions per minute frequency of event
    0 3
    1 9
    2 13
    3 16
    4 9
    5 5
    6 3
    7 1
    8 1
    9 0
    10 0

    Use this data to create a plot similar to that in Figure 5.4.3 and comment on your results

    4. Using the penny data from Exercise 3.4.5, create a plot similar to that in Figure 5.4.4 using all pennies minted after 1982 and comment on your results.

    5. Use this link to access a case study on data analysis and complete the first four investigations included in Part IV: Ways to Model Data.

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