1. To start, you want to get an idea of the daily return that you could have obtained by buying on one trading day and selling on the next (assuming that there are no dividends). Compute the daily net return; i.e. the proportionate change in prices.

Date	Closing Price
20100629	23.89
20100630	23.83
20100701	21.96
20100702	19.2
20100706	16.11
20100707	15.8
20100708	17.46
20100709	17.4
20100712	17.05
20100713	18.14
20100714	19.84
20100715	19.89
20100716	20.64
20100719	21.91
20100720	20.3
20100721	20.22
20100722	21
20100723	21.29
20100726	20.95
20100727	20.55
20100728	20.72
20100729	20.35
20100730	19.94
20100802	20.92
20100803	21.95