This statistics video tutorial explains how to calculate the covariance between x and y. It also explains the significance of negative covariance vs positive covariance.
Correlation Coefficient: https://www.youtube.com/watch?v=11c9cs6WpJU
Statistics - Video Lessons:
https://www.video-tutor.net/statistic.html
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Covariance and Correlation Coefficient:
https://www.youtube.com/watch?v=5wIiOFnXSYs
How To Calculate Covariance:
https://www.youtube.com/watch?v=rb2nU7YZV_I
Least Squares Method:
https://www.youtube.com/watch?v=P8hT5nDai6A
Averages and Uncertainty:
https://www.youtube.com/watch?v=CSJewgNUZKw
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Introduction to Statistics:
https://www.youtube.com/watch?v=XZo4xyJXCak
Mean, Median, Mode, & Range:
https://www.youtube.com/watch?v=A1mQ9kD-i9I
Arithmetic, Geometric, & Harmonic Mean:
https://www.youtube.com/watch?v=6G6i8vSa8Zs
Interquartile Range & Outliers:
https://www.youtube.com/watch?v=STSP8gTSdT8
Standard Deviation:
https://www.youtube.com/watch?v=IaTFpp-uzp0
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Introduction to Probability:
https://www.youtube.com/watch?v=SkidyDQuupA
Probability Formulas:
https://www.youtube.com/watch?v=bddckR734aM
Conditional Probability:
https://www.youtube.com/watch?v=sqDVrXq_eh0
Probability Tree Diagrams:
https://www.youtube.com/watch?v=w4wKXVwtGac
Probability - Standard Normal Distributions:
https://www.youtube.com/watch?v=CjF_yQ2N638