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Can we determine the mean length of stay of employees at the company differs from the mean length of stay at that dangerous industry?

The mean length of visit of employees in a dangerous industry is 16.7 months. One hundred arbitrarily selected employees at the company had a mean length of stay of 17.8 months. At the 0.05 importance level do the data provide sufficient evidence to conclude the mean length of stay of employees at the company differs from the mean length of stay at that dangerous industry? Presume that the population standard deviation of lengths of stay in that dangerous industry is 6.0 months.

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