Identifying Spam Text MessagesBayes' rule can be used to identify and filter spam emails and text messages. This question refers to a large collection of real SMS textmessages from participating cellphone users. In this collection, 747 of the 5574 total messages (13.40 % ) are identified as spam. Ofall spam messages, 17.00 % contain both the word "free" and the word "text" (or "txt"). For example, "Congrats!! You are selected toreceive a free camera phone, txt ****** to claim your prize." Of all non-spam messages, 0.06 % contain both the word "free" and theword "text" (or "bxt").Given that a message contains both the word "free" and the word "text" (or "txt"), what is the probability that it is spam?Round your answer to three decimal places.P(Spam if Text and Free) = i'Almeida, T., Hidalgo, J., Yamakami, A., "Contributions to the Study of SMS Spam Filtering: New Collection and Results," Proceedings ofthe 2011 ACM Symposium on Document Engineering (DOCENG'11), Association for Computing Machinery, Mountain View, CA, 2011.

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Answered: Identifying Spam Text Messages Bayes'…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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What social media tools do marketers commonly use? The “2015 Social Media Marketing Industry Report” by Social Media Examiner (socialmediaexaminer.com) surveyed marketers who commonly use an indicated social media tool. Surveyed marketers who commonly use an indicated social media tool. Surveyed were both B2B marketers, marketers that primarily target consumers. Suppose the survey was based on 500B2B marketers and 500 B2C marketers and yielded the results in the following table below: SOCIAL MEDIA TOOL BUSINESS FOCUS (B2B) (%) BUSINESS FOCUS (B2C) (%) FACEBOOK 88 96 TWITTER 83 77 For each social media tool, at the 0.05 level of significance, determine whether there is a difference between B2B marketers and B2C marketers in the proportion who used each social media tool. State the complete hypotheses (hypothesis null and hypothesis alternative for question (a) above
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