16. The number of visitors to women's clothing shops in a nationwide chain is compared over 21} districts with the number of billboards advertising their new range of clothes. The sample correlation is 0.45, is there evidence of a linear relation between numbers of billboards and number of visitors. What level of signicance do you give to your an swer'? Critical values for Pearson correlation Sample size "n' c: = Ill 10 0.549 '20 0.373 40 0.264 100 0.165