3. RESULTS AND DISCUSSION
The operator performance data were summarized in Table 2 and analyzed using Minitab Statistical Software Package for analysis of variance (ANOVA) and regression models for each performance measure sequentially. The data presented in Table 3 are analyzed with the analysis of variance (ANOVA) technique. It seems from Table 3 that the main effects of the three factors (T, C and G) and the interactions effects (TC, TG, CG and TCG) are significant on production rate based on p-values which are less than
0.05. For this reason, they have been included in a regression model to build a mathematical formulation between these factors and production rate. It can be observed from Figure 3 that table adjustable with third level (31.50 cm) is the highest on production rate among all levels and there is no difference between fourth and fifth levels. This means that it is not needed to raise a table up to 39.50 cm (fifth level). With respect to chair adjustable, the first level
(18.50 cm) and the fifth level (23.50 cm) are representing the highest values on production rate and there is no difference between third and fourth levels
in the chair adjustable. This means it does not matter to raise a chair up to 21.00 cm (third level) or 22.25 cm (fourth level). Regarding gender, female are more productive than male in the assembly stations. With respect to interaction effect between table adjustable and chair adjustable, it can be noticed from Figure 4 that third level of table adjustable (31.50 cm) with fifth level of chair adjustable (23.50 cm) is representing the highest value of production rate. Regarding interaction effect of table with gender, it can be observed from Figure 5 that table adjustable with third level (31.50 cm) with female represents the highest values in production rate among all levels. Also, the interaction effect between chair adjustable and gender is producing the highest value in production rate with first level and/or fifth level of chair adjustable with gender (female) (see Figure 6). It is recommended hiring female in assembly workstation especially which has adjustable chair and table. It can be concluded from this analysis that third level of table adjustable; fifth level of chair adjustable with female will give high productivity of operator performance.
3. RESULTS AND DISCUSSION
The operator performance data were summarized in Table 2 and analyzed using Minitab Statistical Software Package for analysis of variance (ANOVA) and regression models for each performance measure sequentially. The data presented in Table 3 are analyzed with the analysis of variance (ANOVA) technique. It seems from Table 3 that the main effects of the three factors (T, C and G) and the interactions effects (TC, TG, CG and TCG) are significant on production rate based on p-values which are less than
0.05. For this reason, they have been included in a regression model to build a mathematical formulation between these factors and production rate. It can be observed from Figure 3 that table adjustable with third level (31.50 cm) is the highest on production rate among all levels and there is no difference between fourth and fifth levels. This means that it is not needed to raise a table up to 39.50 cm (fifth level). With respect to chair adjustable, the first level
(18.50 cm) and the fifth level (23.50 cm) are representing the highest values on production rate and there is no difference between third and fourth levels
in the chair adjustable. This means it does not matter to raise a chair up to 21.00 cm (third level) or 22.25 cm (fourth level). Regarding gender, female are more productive than male in the assembly stations. With respect to interaction effect between table adjustable and chair adjustable, it can be noticed from Figure 4 that third level of table adjustable (31.50 cm) with fifth level of chair adjustable (23.50 cm) is representing the highest value of production rate. Regarding interaction effect of table with gender, it can be observed from Figure 5 that table adjustable with third level (31.50 cm) with female represents the highest values in production rate among all levels. Also, the interaction effect between chair adjustable and gender is producing the highest value in production rate with first level and/or fifth level of chair adjustable with gender (female) (see Figure 6). It is recommended hiring female in assembly workstation especially which has adjustable chair and table. It can be concluded from this analysis that third level of table adjustable; fifth level of chair adjustable with female will give high productivity of operator performance.
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