Suppose a good friend of yours works in internet security and has great insight into its...

 

 

 
 
 

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Suppose a good friend of yours works in internet security and has great insight into its future. Furthermore, she spends almost all of her spare time studying and investing in the stock market. She has made dozens of stock predictions to you in the last year and of the tech stock predictions she was accurate on 40 out of 50 predictions. Of the non-tech stock predictions, she was accurate on 30 out of 45 predictions. What is your friend's overall probability of accuracy (for a randomly chosen stock)? Suppose a good friend of yours works in internet security and has great insight into its future. Furthermore, she spends almost all of her spare time studying and investing in the stock market. She has made dozens of stock predictions to you in the last year and of the tech stock predictions she was accurate on 40 out of 50 predictions. Of the non-tech stock predictions, she was accurate on 30 out of 45 predictions. What is your friend's overall probability of accuracy (for a randomly chosen stock)?

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