The ABC corporation is opening new retail sales outlets and they want to staff

these stores with employees most likely to be successful at selling the

products. To meet this goal, ABC decides to study the sales staff at existing stores

to determine if intelligence and extroversion (i.e., a friendly and outgoing

personality) predict sales performance of current employees. ABC's logic is that if

intelligence and extroversion predict sales performance, then a good strategy for

new stores is to hire intelligent extroverts for the sales positions.

To conduct the study, all current retail sales employees at existing stores take psychological tests designed to measure intelligence and extroversion. Also, past sales performance data is checked for each employee. In the end, there are three scores for each sales person:

1. an intelligence score (on a scale of 50-low intelligence to 150-high intelligence),
2. an extroversion score (on a scale of 15-low extroversion to 30-high extroversion),
3. and
4. sales performance expressed as the average dollar amount sold per week.

Below are the data collected for 15 sales reps. Sales Person Intelligence Extroversion Sales/Week H 89 21 2625 2 93 24 2700 W 91 21 3100 4 122 23 3150 5 115 27 3175 6 100 18 3100 7 98 19 2700 8 105 16 2475 112 23 3625 10 109 28 3525 11 130 20 3225 12 104 25 3450 13 104 20 2425 14 111 26 3025 15 97 28 3625