Over the past 200 stock-trading days data is collected concerning whether the stock index,

Anonymous
timer Asked: Feb 13th, 2015

Question Description

I’m studying for my Statistics class and need an explanation.

Over the past 200 stock-trading days data is collected concerning whether the stock index, called the S&P 500, increased or decreased as well as whether the individual stock Apple increased or decreased. Apple stock increased in price on 130 of the days. The S&P 500 increased on 150 of the days. Finally, Apple increased and the S&P 500 increased on 100 of the days. (assume the index either increases or decreases and assume the stock either increases or decreases, ie, neither the stock nor the index ever stays the same from the previous day) What is the probability that on a randomly chosen day that Apple’s stock price decreases or the S&P Index increases? (please round your answer to 4 decimal places)

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