# Data assignment unit 4.docx - Correlation Between Students...

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2. a) 5.5 6 6.5 7 7.5 8 8.5 9 9.5 0 10 20 30 40 50 60 70 80 90 Correlation Between Students Marks and hours of sleep Hours of Sleep Average Marks b) PPMCC = 0.762294 c) I would conclude that the relationship between hours of sleep and a student’s average mark is a strong positive linear correlation. This is because the PPMC is close to 1, indicating that the correlation between the variables is strong. It can also be proved by looking at the graph, which shows that the average mark of a student increases as they get more sleep. The graph has a positive trend, with no visible outliers. 3. One reason that the conclusion deducted from the graph may be inaccurate is because it is very cut and dry; meaning that it is a simple cause and effect conclusion. Gauntlet concluding that piracy does not harm music sales may not be correct since there could be other factors that explain this that go beyond the surface of what the data presents. For example, the people that were surveyed may have all downloaded music from certain select websites that offer low quality versions of songs, consequently making the users want to buy the songs instead. They may have excluded data from users that
• Fall '19
• researcher, Causality, Correlation and dependence

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