Page 8 of 8 Question 5: (9 marks) A number of minor automobile accidents occur at various high-risk intersection despite traffic lights. The traffic department claims that a modification in the type of light will reduce these accidents. The traffic commissioners have agreed to a proposed agreement. Eight intersections were chosen at random, and the lights at those intersection were modified. The number of minor accidents during a six-month period before and after modification were as follows: (a = 0.01 level is used.) Use the analysis below to answer to the questions t-Test: Two-Sample Assuming Unequal Variances Before After Mean 7.125 4.625 Variance 4.125 7.982143 Observations 8 Hypothesized Mean Difference 0 df 13 t Stat 2.032189 P(T