The lifetime of 19 successively produced storage batteries is as follows:

145 152 148 155 176 134 184 132 145 162 165 185 174 198 179 194 201 169 182 The sample median is the 10th smallest value—namely, 169. The data indicating whether the successive values are less than or equal to or greater than 169 are as follows:

1 1 1 1 0 1 0 1 1 1 1 0 0 0 0 0 0 1 0 Hence, the number of runs is 8. To determine if this value is statistically significant, we run Program 12.5 (with n = 10,m = 9) to obtain the result:

p-value = .357 Thus the hypothesis of randomness is accepted.