The mass of Earth is about 
kilograms. The mass of Neptune is about 
kilograms. Write the mass of Earth divided by the mass of Neptune in scientific notation.
Definitions:
Pearson Correlation Coefficient
The Pearson Correlation Coefficient is a measure of the linear correlation between two variables, ranging from -1 to +1, where 1 means a perfect positive correlation and -1 means a perfect negative correlation.
Negative Numbers
Numbers less than zero, represented by a minus (-) sign.
Critical Values
Specific points on the scale of a test statistic that determine the threshold for rejecting a null hypothesis.
Two-Tailed
Two-Tailed tests in statistics are used to determine if there is either a positive or negative effect, and the significance is checked in both directions of the distribution.
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