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Suppose Mercury had 5-to-3 spin-orbit coupling and that its sidereal period remained 88 days,as now.You observe the Sun directly overhead in the Mercurian sky and then observe again from the same location 88 days later.Where will the Sun be in the sky? (Mercury,like Earth,rotates toward the east.)
Directional
Pertains to hypotheses or tests that specify the expected direction of the relationship or difference between variables, as opposed to non-directional or two-tailed tests.
Non-directional
A hypothesis that does not specify a direction of difference or association between two variables.
Standard Error
A measure of the statistical accuracy of an estimate, indicating how much the sample mean is expected to vary from the true population mean.
Mean
The average of a set of numbers, calculated by dividing the sum of all values by the count of values, and used as a measure of central tendency.
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