28. According to a union agreement, the mean income for all senior-level assembly-line work- cis in a large company equals $500 per week. A representative of a women's group de- cides to analyze whether the mean income for female employees matches this nonn For a random sample of nine female employces, = $410 and s = 90 Conduct a signifi- cance test of whether the mean income of female employees differs from $500 per week. Include all assumptions, the hypotheses. test statistic, and P-value. and interpret the re- sult