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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?
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