Exercise 11.2- Chi - Square

Table 11.1 Partial Table for the Tabular value of the Chi-square Test at .01 and .05 Level of Significance .050 .010 df 3.841 6.634 53992 9.210 7.815 11.345 9.488 13.277 11.070 15.086 12.592 16.812 14.067 18.475 15.507 20.090 16.919 21:666 8.307 23.209 11 19.675 24.725 12 21.026 26.217 13 22.363 27.688 14 23.685 29.141 15 24.996 30.578.3. Four toothpastes were tested by randomly dividing 400 children into four groups of 100. Each group used a different brand of toothpaste for one year, and then the following results were observed: Brand of Number of New Cavities Toothpaste 0-1 2-3 4 or more A 50 28 22 B 41 30 29 C 39 23 38 D 36 27 37