In the Coastal Forest of Oregon an Area Was Clear-Cut

question 2

Multiple Choice

In the coastal forest of Oregon an area was clear-cut for logging. Trees at the edge of the clearing and 200 meters into the forest died within a few months after the logging began. What is the best explanation for the death of the trees?

• A) The trees at the edge of the forest were more prone to disease
• B) Increased sunlight, wind and temperature negatively affected the trees
• C) The roots of all of the trees were damaged
• D) Nitrogen fixing bacteria in the roots of the trees were killed

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Definitions:

Corresponding P-Value

The probability of obtaining a test statistic at least as extreme as the one that was actually observed, assuming that the null hypothesis is true.

Null Hypothesis

A hypothesis that suggests there is no statistical significance between the two variables being studied or no effect of a treatment.

Plus Four Estimate

A technique in estimating a binomial proportion and its confidence interval by adding four observations, two of which are successes and two are failures.

Population Proportion

The fraction or percentage of a population that exhibits a specific attribute or characteristic.