Database - Data Mining

66. In collaborative filtering based recommendation, the items are recommended based on:

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67. The major limitation of collaborative filtering is:
a. Cold start
b. Overspecialization

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A spam filtering system has a probability of 0.95 to classify correctly a mail as spam and 0.10 probability of giving false positive. It is estimated that 0.5% of the mails are actual spam mails.

68. Suppose that the system is now given a new mail to be classified as spam/ not-spam, what is the probability that the mail will be classified as spam?

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A spam filtering system has a probability of 0.95 to classify correctly a mail as spam and 0.10 probability of giving false positive. It is estimated that 0.5% of the mails are actual spam mails.

69. Find the probability that, given a mail classified as spam by the system, the mail actually being spam

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A spam filtering system has a probability of 0.95 to classify correctly a mail as spam and 0.10 probability of giving false positive. It is estimated that 0.5% of the mails are actual spam mails.

70. Given that a mail is classified as not spam, the probability of the mail actually being not spam

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