In: Statistics and Probability
Data from 2010 & 2011, in millions (source: Billboard Magazine):
Company Annual Revenue Market Valuation
Spotify 145 3,000
Warner Music 2,888 3,300
Live Nation 5,600 1,700
Pandora 241 1,300
EMI 1,800 1,900
3a) Find the correlation between annual revenue and market valuation. Is it statistically significant?
3b) Why is the correlation between revenue and market valuation so low?.
Answers:
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Given data:
Annual Revenue | Market Validation |
1450 | 3000 |
2888 | 3300 |
5600 | 1700 |
2410 | 1300 |
1800 | 1900 |
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Ans 3a)
The correlation between annual revenue and market valuation is,
Annual Revenue | Market Validation | |
Annual Revenue | 1 | -0.088819234 |
Market Validation | -0.088819234 | 1 |
Coefficients | Standard Error | t Stat | P-value | Lower 95% | Upper 95% | |
Intercept | 4130.86631 | 2477.238932 | 1.667528 | 0.194001 | -3752.813576 | 12014.5462 |
Market Validation | -0.58092246 | 1.045332245 | -0.55573 | 0.617151 | -3.907636201 | 2.745791281 |
Here is the p-value is 0.617 which is greater than 0.05 level of significance which means our null hypothesis is accepted and they are statistically insignificant.
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Ans 3b)
The correlation between revenue and market valuation so low because Annual Revenue is very low in the case of company Spotify and company Pandora. If the Annual Revenue is high then our correlation value will be high.
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