Could you estimate the beta of APPLE stock based on the data provided in Yahoo! Finanace?

Suggested steps are as follows.

1. Download the excel profile for the stock close price of APPLE and the index price of the S7P 500 for one year.

2. Calculate the dailt return by using (PT+1-PT)PT for APPLE stock and S&P500?

3. Run regression for these two series of return data or use Excel function SLOPE() to obtain the estimtaed beta for APPLE stock

4. Compare the estimated beta you obtained with the one estimated by Yahoo!Finanace agencies and try to briefly explain the possible reason of the differnece.