The numbers of defective electrical fuses produced by two production lines, A and B, were recorded daily for a period of 10 days, with the results shown in Table 15.6. The response variable, the number of defective fuses, has an exact binomial distribution with a large number of fuses produced per day. Although this variable will have an approximately normal distribution, the plant supervisor would prefer a quick-and-easy statistical test to determine whether one production line tends to produce more defectives than the other. Use the sign test to test the appropriate hypothesis.

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Defective Fuses from Two Production Lines Day Line A Line B Sign of Difference 1 170 201 23 2 164 179 3 140 159 4 184 195 5 174 177 6 142 170 7 191 183 + 8 169 179 9 161 170 10 200 212