I need this answer ASAP please.

The average weekly earnings of a production worker in 2000 were AUD428. Suppose a labor researcher wants to test to determine whether this figure is still accurate today. The researcher randomly selects 56 production workers and obtains a representative earnings statement for one week from each. The resulting sample average is AUD430.6. Assuming a population standard deviation of AUD32.8, and a 5% level of significance, determine whether the mean weekly earnings of a production worker have changed. Determine the critical value zc and z score value z based on the sample data. The critical value zo = The z score value z based on the sample data =