A web manager for a retail merchant tests two different presentations of a product to determine whether there is a difference in the length of time that people stay on that product page.

A web manager for a retail merchant tests two different presentations of a product to determine whether there is a difference in the length of time that people stay on that product page. He or she records the visit time in seconds per visitor for 50 visitors for each presentation and finds that people viewing presentation A linger 0.33 seconds longer than those viewing presentation B. From the histogram shown below for a permutation test between the two treatments (putting all 100 values in a hat and repeatedly drawing out pairs of random samples of 50 each), is the observed difference within the range of chance variation?

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