Anational firm reports mean earningsof$75 $12 ( )per unit sold overthelifetimeof thecompany. ACompeting Company OverThePast 36 Reporting Periods Had Reported Mean Earnings EqualTo$78 Per Unit Sold.ConductAOne-sample ZTest To determine whether the mean earnings (in dollars per unit) are larger (compared to that reported by the national firm) at a 0.05 level of significance. State the value of the statistic and whether to retain or reject the null hypothesis. Compute effect size using Cohen's d.