In a study of the cognitive capacities of non-human primates, 19 monkeys of the same age are randomly divided into two groups of 10 and 9. The groups are trained by two different teaching methods to recollect an acoustic stimulus. The monkeys' scores on a subsequent test are seen below.

Do the data strongly indicate a difference in the recollection abilities of monkeys trained by the two methods? Use the Wilcoxon rank-sum test with a close to .10.

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Memory Scores Method 1 167 149 137 178179 155 164 104 151 150 Method 2 98 127 140 103 116 105 100 95 131