Constructing an Hypothesis statement-How to set it up by ilo32820


									Biology                                                    Ecocolumn Project

Constructing an Hypothesis statement-How to set it up:
          The “IF..and..then..” format

                       Causal question/Purpose

                  What is the effect of excess product X
                      on field, garden and woods
                             ecosystems ?

                       Proposed Explanation-Hypothesis, pt 1

          If….    Product X is harmful only to weeds

                             Planned test-hypothesis, pt 2

          and….   it is added in normal vs. excess amounts
                   to 2 different ecocolumns

                             Expected result-hypothesis, pt 3

          then…    the column with excess product X
                   should have more weeds killed than the one with
                   normal amounts; in the control all weeds should
                   survive and in neither experimental column should
                   there be any other adverse effects on other plants. All
                   the animals should live in all 3 columns.
 Biology                                                   Ecocolumn Project

(The following are examples of what might be seen at the end of the
                       Observed Results/Analysis

            All plant types wilted in the excess column and
            all ants died. Only weeds died in the normal column
            and all ants died. In the control, all plants lived and no ants

restate the “then” part of the hypothesis with the final answer

                   Excess of product X is harmful to all plant types, not
                  just weeds. Product X is harmful to ants even when
                  used as directed. Product X, used as directed, will not
                  hurt other plants.
Biology                                                         Ecocolumn Project

                         Sample Hypotheses

Read each of the following hypotheses – which one is the best wording to use
based on the following problem being investigated: How does wind effect
transpiration rates in begonias? What attributes make it the best choice? What is
wrong with each of the other ones?

Hypothesis A: The amount of air movement around begonias influences

Hypothesis B: I think that more wind will make plants lose water faster.

Hypothesis C: Faster winds hurt begonias.

Hypothesis D: If faster winds cause greater transpiration rates, and begonias are
exposed to various speeds, then begonias exposed to faster wind will lose water
faster than those exposed to lower winds.

Hypothesis E: If it is windy, begonias will be okay because they are exposed to
wind all the time.

Hypothesis F. Transpiration rates will not have an effect on the growth of

Hypothesis G: If there are faster winds and begonias are exposed to them, then
the begonias will lose leaves and they won’t be able to evaporate water as much.

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