Problem 7.36 An experiment was conducted to compare the electrical resistances (mea[1]sured in ohms) of resistors supplied by two manufacturers, denoted A and B, respectively. Six resistors from each manufacturer were randomly selected and their resistances measured; the following data were obtained: Brand A 0.140 0.138 0.143 0.142 0.144 0.137 Brand B 0.135 0.140 0.142 0.136 0.138 0.140 Assume both data sets come from normal populations. Construct a 95% confidence interval for the difference between the mean resistances.