A human resources manager for a car company wanted to know whether production-line workers have more days absent than office workers. He took a random sample of eight workers from each category and recorded the number of days absent the previous year. Assume equal population variances. The manager is interested in constructing a 95% confidence interval for the difference.

Production line	4	0	6	8	3	11	13	5
Office	9	2	7	1	4	7	9	8

1.Determine the t-value to be used to construct a 95% confidence interval of the difference.

2. At 95% confidence level, determine the margin of error. Keep to 2 decimal places.

3. At 95% confidence level, calculate the upper confidence limit. Keep to 2 decimal places.