Question

company a and company b stock value chart
company a and company b have historically shown a strong positive correlation in their stock prices. both companies operate within the same industry, which has led to similar stock - performance patterns over the past year. a significant regulatory change was recently announced that negatively impacted the entire industry. as a result, company a and company b stock prices dropped substantially.
the chart shows the stock prices of company a and company b over time, including the sharp decline following the regulatory change.
based on the chart, can we conclude that the drop in company as stock price caused the drop in company bs stock price?
no, because correlation does not imply causation, and both companies could have been affected by the same external factor
no, because company bs stock price is independent of company as stock price.
yes, because both companies experienced a similar drop in prices.
yes, because company as price started to drop before company bs price.

Explanation:

Correlation between two variables does not imply causation. Just because Company A and Company B's stock - prices both dropped does not mean that one caused the other's drop. They could have been affected by the same external factor (the regulatory change in this case).

Answer:

No, because correlation does not imply causation, and both companies could have been affected by the same external factor.