Assume that the average weekly earnings of a production worker in 2010 were $424.20. Suppose a labour analyst wants to determine whether this figure is still accurate today. The analyst randomly selects 54 production workers from across Canada and obtains a representative earnings statement for one week from each. The resulting sample average is $432.69. Assuming a population standard deviation of $33.90 and a 5% level of significance, determine if there is sufficient evidence to claim that the mean weekly earnings of a production worker have changed.