Radio advertisements have been stressing the virtues of an audiotape program to help children learn to read.

To test whether this tape program can cause a quick improvement in reading ability, 10 children were given a nationally recognized reading test that measures reading ability. The same 10 children were then given the tapes to listen to for 4 hours spaced over a 2-day period. The children then were tested again. The test scores were as follows:

Child Before After 1 60 63 2 40 38 3 78 77 4 53 50 5 67 74 6 88 96 7 77 80 8 60 70 9 64 65 10 75 75 If higher scores are better, use the Wilcoxon matchedpairs signed rank test to test whether this tape program produces quick improvement in reading ability. Use an a  0.025.