Question: For problem, construct a 95% confidence interval for the difference in stock performance.
Problem: "Strategizing for the future" is management lingo for sessions that help managers make better decisions. Managers who deliver the best stock performance get results by bold, rule-breaking strategies. To test the effectiveness of "strategizing for the future," companies' 5-year average stock performance was considered before, and after, consultant-led "strategizing for the future" sessions were held.
Before (%) After (%)
10 12
12 16
8 -2
-5 10
-1 11
5 18
-3 -8
16 20
-2 -1
13 21
17 24
Test the effectiveness of the program, using α = 0.05.