Kim,
Look at it this way -- The ISO setting is something you set as a parameter, like you would the white balance or the size of your Jpeg image. It remains set even when you turn your camera on and off.
The shutter speed, however, is a very dynamic number that changes constantly as the scene [light] coming into the camera changes.
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There are numbers like -3 or 3.
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Beth,
This may be an exposure compensation. My camera will adjust in increments of 1/3 of a "stop."
I think the DPreview site is very helpful in describing the different switches of various cameras.
http://www.dpreview.com/reviews/canoneos300d/