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Basic Statistics

Some questions about basic statistics. These questions should belong to a qualification course.
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ID P Question or exercise
4045 1 Timber volume per hectare was measured in three randomly selected sites in forested areas in Estonia.
Does these measurement represent the mean per hectare timber volume in Estonian forests?
Open
4046 1 What can be concluded if an empirical distribution of values differs significantly from the expected distribution of the same variable? Open
4047 1 What can be concluded about statistical relationship between the two variables in the total population if the linear correlation coefficient (R) calculated from an empirical sample = 0. Open
4048 1 What is the main difference between significance level (alpha, a) and statistical significance (p-value, p)? Open