Consider the data set shown in Table 7.12.
Table 7.12. Data set for Exercise 4.

(a) For each combination of rules given below, specify the rule that has the highest confidence.
i. 15 ii. 15 iii. 15 (b) Suppose we are interested in finding the average number of hours spent online per week by Internet users between the age of 15 and 35. Write the corresponding statistics-based association rule to characterize the segment of users. To compute the average number of hours spent online, approximate each interval by its midpoint value (e.g., use B = 7.5 to represent the interval 5 (c) Test whether the quantitative association rule given in part (b) is statistically significant by comparing its mean against the average number of hours spent online by other users who do not belong to the age group.

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Age Number of Hours Onie per Week (B) (A) 0-55-10 10-20 20-30 30-40 10 152 15 252 25 351015 35 504 10 10