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. 1In this collection, 747 of the 5574 total messages (13.40 % ) are identified as spam. Theword "text" (or "txt") is contained in 7.01 % of all messages, and in 38.55 % of all spam messages.What is the probability that a message is spam, given that it contains the word "text" (or "txt")?Round your answer to three decimal places.P(Spam if Text) ='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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A samll town installed a Blue streetlights, in part, to help reduce crime in particular areas. The city collected the number of property crimes along nine randomly selected streets in the month before and after the Blue light installation, and claims that crime has been reduced.The number of crime data is shown in the table. No before Blue Light After Blue Light 1 17 14 2 25 20 3 10 14 4 14 12 5 16 8 6 34 35 7 32 27 8 21 18 9 14 12 a. Specify the competing hypotheses to test the s,all town's claim.b. Calculate the value of the relevant test statistic and find the critical value at the 5% significance level.c. Does the evidence support the small town's claim at the 5% significance level?
Medical researchers followed 6272 Swedish men for 30 years to see if there was any association between the amount of fish in their diet and prostate cancer. (“Fatty Fish Consumption and Risk of Prostate Cancer,” Lancet, June 2001). A summary of the data is given in the table below. Fish Consumption No Prostate Cancers Prostate Cancers Never/Seldom 110 14 Small part of diet 2420 201 Moderate part of diet 2769 209 Large part of diet 507 42 A) If a patient is randomly selected, what is the probability that he/she had prostate cancer given that fish was never or seldom a part of the diet? Round your answer to three decimal places and include the leading zero. B) If a patient is randomly selected, what is the probability that s/he ate fish as a large part of their diet given that they had prostate cancer. Round your answer to two decimal places and include the leading zero.
About 4% of the population has a particular genetic mutation. 600 people are randomly selected. Find the mean for the number of people with the genetic mutation in such groups of 600. Submit Question acer
A study suggests that airlines have increased restrictions on cheap fares by raising overnight requirements. This forces business travelers to pay more for their flights, since they tend to need the most flexibility and want to be home on weekends. A year ago, the overnight stay requirements were as follows: One night Two nights Three nights Saturday night 37% 17% 28% 18% A recent sample of 644 flights found the following restrictions: One night Two nights Three nights Saturday night 117 137 298 92 a. Choose the appropriate alternative hypotheses to test whether the proportions differ from those cited in the study. All population proportions differ from their hypothesized values. At least one of the population proportions differs from its hypothesized value. b-1. Calculate the value of the test statistic. (Round intermediate calculations to at least 4 decimal places and your final answer to 3 decimal places.) b-2. Find the p-value. p-value < 0.01…
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A foundation asked each person in a representative sample of high school students and in a representative sample of high school teachers which of the rights guaranteed by the First Amendment they thought was the most important. Suppose that the sample size for each sample was 1,000. Data consistent with summary values from the study are summarized in the accompanying table. Students = Teachers Freedom of Speech 658 400 USE SALT Most Important First Amendment Right Freedom of Religion Freedom to Peacefully Assemble Freedom of the Press 30 55 245 420 20 55 Freedom to Petition the Government 47 70 (a) Carry out a hypothesis test to determine if there is convincing evidence that the proportions falling into the five First Amendment rights categories are not the same for teachers and students. Use a significance level of a = 0.01. Calculate the test statistic. (Round your answer to two decimal places.) x²= Use technology to calculate the P-value. (Round your answer to four decimal places.)…

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