Question
According to the random-walk model for stock prices, the price movements of stocks on a given day are not influenced by movements in the prices
According to the "random-walk model" for stock prices, the price movements of stocks on a given day are not influenced by movements in the prices on previous days. We've recorded closing price information for hundreds of NASDAQ stocks from last Monday, Tuesday, and Wednesday with the aim of testing this model. The contingency table below displays some information for a random sample of 500 stocks. The variables examined in the table are closing price movement from Monday to Tuesday ("closing price is up on Tuesday" or "closing price is not up on Tuesday") and closing price movement from Tuesday to Wednesday ("closing price is up on Wednesday" or "closing price is not up on Wednesday")
Each cell of the table has three numbers: the first number is the observed cell frequency (fO); the second number is the expected cell frequency (fE) under the assumption that there is no association between the two variables closing price movement from Monday to Tuesday and closing price movement from Tuesday to Wednesday; and the third number is the following value.
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