A cleaning service firm recently began to outsource some of its workload. In an effort to see what impact outsourcing had on customer satisfaction, it sent a series of surveys to a randomly selected sample of recent clients. The sample of 100 clients gave an average customer satisfaction rating of 4.5 with a standard deviation of 1. The firm wants to know if this result is meaningfully different from their benchmark score of 4.0
Calculate the standard error for mean customer satisfaction
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