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The purchasing department has suggested that all new computer monitors for your company should
be a new design. You want data to assure you that employees will like the new monitors. The next 20
employees needing a new computer are the subjects for an experiment.
(a) Label the employees 01 to 20. Randomly choose 10 to receive new monitors. The
remaining 10 get standard monitors.
(b) After a month of use, employees express their satisfaction with their new monitors by
responding to the statement "I like my new monitor" on a scale from 1 to 5, where 1 represents
"strongly disagree", 2 is "disagree", 3 is "neutral", 4 is "agree", and 5 stands for "strongly agree'.
The employees with the new monitors have average satisfaction 4.4 with standard deviation 0.7.
The employees with the standard monitors have average 3.2 with standard deviation 1.5. Give a
95% con dence interval for the di erence in the mean satisfaction scores for all employees.

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