Reading Nook Bookstore has 750 retail outlets across the country. The sales director wanted to see i
Question: Reading Nook Bookstore has 750 retail outlets across the country. The sales director wanted to see if Christmas music affects book sales in December. She randomly assigned some of the outlets to pipe in music and others not to. Then sales records for the month of December were kept. The results are shown in Table 11-11. Test the hypothesis that sales and Christmas music are independent. Use a 0.05 level of significance.
| Outlet | Less than 10,000 | 10,000-20,000 | More than 20,000 | Row Total |
| With Music | 5 | 18 | 7 | 30 |
| Without Music | 10 | 7 | 3 | 20 |
| Column Total | 15 | 25 | 10 | 50 |
\(\chi \) 2 test = 6.361
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