Example 10.1 tv station wanted to study the relationship between the number of tv households with income of households number of households 1000, so a random household sample is random and classified by the number of televisions and household income results shown in the table.The number of television Monthly income (baht) included. Less than 5000 5000 – 8000 8001 – more than 10000 10000. 1 126 (107.7), 362 (347.2) 129 (146.6) 78 (93.1) 695. 2 29 (47.3), 138 (152.5) 82 (64.4), 56 (40.9) 305. Total 155 500 211 134 1000From the above information. We can conclude whether or not the amount of tv, depending on the income of the household.By using a significance level = 0.01In this We want to test. H0: the number of television does not depend on the income of the household. H1: the number of television depends on the income of the household.The test statistic is. = We expect from frequency calculation formula = Eij By the value of the Eij displayed in parentheses in the table above. Calculate the value of the above as follows: = + + . . . + = 27.14Degrees of freedom in these hotels is = (2 – 1) (4 – 1) = 3.The district refused = 0.01 significance level is that we will reject H0 if 11.345.- 4 -To see whether the value of a = 27.14 fall in zone denial so we reject H0 = 0.01 significance level, concluded that the number of television depends on the income of the household.
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