This production data was recorded during the last quarter of operations at Metal Company.

Week	Unit Produced	Machine Hours
1	1,692	4,153
2	1,330	2,529
3	1,559	3,184
4	1,633	3,531
5	1,432	2,893
6	1,572	2,282
7	1,372	2,955
8	1,433	3,016
9	1,795	4,200
10	1,464	2,772
11	1,723	2,166
12	1,278	2,507

Required a) Plot machine hours versus units produced.

b) Estimate the number of machine hours per unit of production using the high-low method.