In comparing two populations using paired differences,after the difference is found for each pair,the method for testing whether the mean difference is equal to 0 becomes the same as was used for a one-group hypothesis test with unknown standard deviation.

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This statement is true. After finding the difference for each paired observation, the testing of whether the mean difference is equal to 0 is equivalent to performing a one-sample hypothesis test with an unknown population standard deviation, which is the same as what is done in a one-group hypothesis test.

In Comparing Two Populations Using Paired Differences,after the Difference Is