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You take a certain rock and drop it in a 9 foot deep pool and measure how many seconds it takes to reach the bottom. You do this 500 times. The average time is 3.2 seconds and the SD is .2 seconds. In one drop how much is the time likely to be off? 2.0 sec 0.2 sec 0.02 sec .002 sec none of the above

You may use the calculator above and this area as scratch paper. To see the solution just click on the button.

Carlos Rodriguez <carlos@math.albany.edu>

This problem was contributed by a student in Elementary Statistics. It is offered as it is with no warranty of any kind
Last modified: Wed May 13 12:29:11 EDT 1998