Confidence Interval: Matched Pairs

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The CEO of ABC Coffee Shop wishes to know if training their employees will make them quicker at serving customers. He randomly selects 7 employees and records the number of hourly customers served without training for four days and with training for another four day period. Here are his results:


a) At the 10% level of significance, what should the CEO conclude?
b) Compute a 90% confidence interval for the mean difference in their work performance.

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