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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
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.
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