To determine on which day the new machine makes a positive impact on production, let's analyze the data from the table. The usual production range is between 20 to 22 donuts per hour. We'll look for the first day when production exceeds this usual range. Here’s a step-by-step breakdown:
1. Day 1: The production is 20 donuts per hour. This is within the usual range (20-22). No positive impact yet.
2. Day 2: The production is 22 donuts per hour. This is also within the usual range (20-22). No positive impact yet.
3. Day 3: The production is 21 donuts per hour. This remains within the usual range (20-22). No positive impact yet.
4. Day 4: The production drops to 10 donuts per hour. This is below the usual range and indicates no positive impact yet.
5. Day 5: The production is 15 donuts per hour. This is still below the usual range. No positive impact yet.
6. Day 6: The production jumps to 50 donuts per hour. This is significantly higher than the usual range (20-22). This suggests a positive impact, as the new machine is likely contributing to the increased production.
7. Day 7: The production is 55 donuts per hour, which is also above the usual range. However, the positive impact was first observed on the previous day.
From this analysis, we see that the first day when the production exceeds the usual range (20-22 donuts per hour) is Day 6.
Therefore, the machine makes a positive impact on production on Day 6.
