1/ A production manager wishes to examine if there is a significant difference in the number of production units produced by the night shift and the day shift. A random sample of night and day shifts was selected, and the number of production units for each shift was recorded. The following results were obtained:
Mean S N
Day shift 23.4 7.2 70
Night shift 19.5 6.3 70
Using a 5% significance level, present your conclusion.
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