Resizing and resampling

1. when do you want to keep the resample checkbox checked when changing the size of an image?
2. When typing a new resolution with resample checked, why does the top pixel dimensions change, though the document size does not?
3. If I type in a higher resolution with resample unchecked, it makes the image smaller, though the image now has a higher resolution. Does this mean that the same number of pixels are now just being used in the smaller image?
Any help is appreciated.

1. when do you want to keep the resample checkbox checked when changing the size of an image?
If you have to ask, then I would say (almost) never. Resampling changes the number of pixels making up your image. Resampling can improve or completely degrade your file. Yet Adobe has it checked by default. I can't tell you how many clients I have had come to me with totally ruined images because of resampling an image without knowing what they were doing.
2. When typing a new resolution with resample checked, why does the top
pixel dimensions change, though the document size does not?
Document size should change... where are you seeing that information showing it does not? The PS Image Size dialog will show the open document size above the pixel dimension. With Resample checked, any changes in pixel width or height should reflect in the document size.
3. If I type in a higher resolution with resample unchecked, it makes
the image smaller, though the image now has a higher resolution. Does
this mean that the same number of pixels are now just being used in the
smaller image?
YES!!

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