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You can't assign a resolution to an InDesign page. An image you place retains its original resolution, with an "effective" resolution, factored by any scaling you apply in the InDesign editing environment, honored at output.
When you place an image, InDesign writes a dedicated "proxy" image for use in displaying your layout work. There are Display Performance settings (in Preferences and on the View menu), that will render the proxy image at varied fidelities, allowing you to accept a lower fidelity display in favor of increased screen-redraw speed, or sacrifice speed in favor of higher fidelity appearance.
You should set you dpi preference in photoshop under image size. This will assure it is not going to be blurry when place into you InDesign file.
You select the resolution of an image via Photoshop, as mentioned by John, but the Effective resolution depends on the size you make the image in InDesign -- enlarge the image and you reduce the resolution. You normally want an Effective resolution of between 200 and 300 PPI.
Note, the nomenclature for resolution is PPI (Pixels Per Inch), DPI (Dots Per Inch) is for the resolution of printers, such as laser and inkjet printers.
Agree with Derek, but we've increased our standard resolutions in InDesign layouts:
The resolution can be reduced when the print-PDF, web-PDF, and EPUB are exported. In other words, we can "dumb-down" the resolution as needed for a particular type of PDF, so a higher resolution to start is best. Gives the layout enough wiggle room and clarity of graphics to work for many different media.