Mental measurements of young children are often made by giving them blocks and telling them to build a tower as tall as possible. One experiment of block building was repeated a month later, with the times (in seconds) listed below. Use a 0.01 level of significance to test the claim that there is no difference between the two times.

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First trial 30 19 19 23 29 178 42 20 12 39 14 81 17 31 52 Second tria 30 6 14 8 14 52 14 22 17 8 11 30 14 17 15 Based on data from "Tower Building." by Johnson and Courtney, Child Development, Vol. 3.