(b) Brick made in two kilns have been graded as facings (high quality), seconds (medium quality) and common (rather poor quality). The production of bricks in a particular period was a; follows: Klin Facings 000 Seconds '000 Common '000 A 24 43 13 B 31 57 32 Test whether Klin and quality of bricks are independent or not at 10% level of significance