Question: Bank tellers were imparted a training program to improve quality of their work and they were expected not to make more than one error per

Bank tellers were imparted a training program to improve quality of their work and they were expected not to make more than one error per day thereafter. After the training twelve bank tellers were randomly sampled and it was determined that they made an average of 3.6 errors per day with a sample standard deviation of 0.42 error. Was the training program effective? State and test the relevant hypothesis at 95% confidence level.

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