According to the U.S. Bureau of Labor Statistics, the average weekly earnings of a production worker in manufacturing in the United States as of October 2018 was $867.60. Suppose a labor analyst wants to test to determine whether this figure is still accurate today. The analyst randomly selects 54 production workers from across the United States and obtains a representative earnings statement for one week from each worker. The resulting sample average is $886.30. Assuming a population standard deviation of $63.90 and a 5% level of significance, determine whether the mean weekly earnings of a production worker have changed.