Consider the data set shown in Table 7.4. Suppose we apply the fol- lowing discretization strategies to the continuous attributes of the data set.
D1: Partition the range of each continuous attribute into 3 equal-sized
bins.
D2: Partition the range of each continuous attribute into 3 bins; where
each bin contains an equal number of transactions
For each strategy, answer the following questions:
i. Construct a binarized version of the data set.
ii. Derive all the frequent itemsets having support ? 30%.
Table 7.5 shows the discretized data using D1, where the discretized
intervals are:
• X1: Temperature between 80 and 87,
• X2: Temperature between 88 and 95,
• X3: Temperature between 96 and 103,
• Y1: Pressure between 1025 and 1051,
• Y2: Pressure between 1052 and 1078,
• Y3: Pressure between 1079 and 1105.
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DTDs are used to ________.
a) describe the structure of an XML document b) enable an XML parser to verify whether an XML document is valid c) verify whether an XML document’s elements contain the proper attributes and appear in the proper sequence d) All of the above.
Answer the following statements true (T) or false (F)
1. A thread is not runnable if it has terminated. 2. Some operating systems use timeslicing with threads. Therefore, they can enable threads to preempt threads of the same priority. 3. When the thread’s quantum expires, the thread returns to the running state as the op- erating system assigns it to a processor. 4. On a single-processor system without timeslicing, each thread in a set of equal-priority threads (with no other threads present) runs to completion before other threads of equal priority get a chance to execute 5. To determine the difference between two Instants, use class Duration’s static method difference, which returns a Duration object containing the time difference.