Answer:
1. A change in the quality of materials purchased
Variance: Direct materials quantity variance
2. A new supplier contract
Variance: Direct materials price variance
3. Error in the accounting records
Variance: Direct materials price variance
4. Change in proportion of spoiled materials
Variance: Direct materials quantity variance
5. Unreasonable standard
Variance: Direct labor efficiency
6. Unanticipated overtime hours
Variance: Direct labor rate variance
7. A change in the government-mandated minimum wage
Variance: Direct labor rate variance
8. Equipment malfunction
Variance: Direct labor efficiency
9. A change in average worker experience or training
Variance: Direct labor efficiency