Write DESCRIPTIVE or INFERENTIAL (all letters are capitalized)for each.The average age of thestudents in a particular historyclass is 19 years.INFERENTIALThere is a relationship betweensmoking cigarettes and gettingemphysema.From past figures, it ispredicted that 40% of theregistered voters in Californiawill vote in the next primary.The chances of winning theMaryland Lottery are onechance in 22 million.

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Answered: The average age of the students in a…

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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An anger-management course claims that, after completing its seminar, participants will lose their tempers less often. Always a skeptic, you decide to test this claim. A random sample of 12 seminar participants is chosen, and these participants are asked to record the number of times that they lost their tempers in the two weeks prior to the course. After the course is over, the same participants are asked to record the number of times that they lost their tempers in the next two weeks. The following table lists the results of the survey. Using these data, test the claim at the 0.10 level of significance assuming that the population distribution of the paired differences is approximately normal. Let participants before completing the anger-management course be Population 1 and let participants after completing the anger- management course be Population 2. Number of Times Temper Was Lost during a Two-Week Period 10 11 6 3 4 59 12 12 11 4 8 12 6 4 5 4 4 11 13 12 5 Before After Copy Data…
e-Books A study by the Pew Internet & American LifeProject found that 78% of U.S. residents over 16 yearsold read a book in the past 12 months. They also foundthat 21% had read an e-book using a reader or computer during that period. A newspaper reporting on these find-ings concluded that 99% of U.S. adult residents had reada book in some fashion in the past year. (http://libraries.pewinternet.org/2012/04/04/the-rise-of-e-reading/) Do youagree? Explain.
An anger-management course claims that, after completing its seminar, participants will lose their tempers less often. Aways a skeptic you decide to test this claim. A random sample of 12 seminar participants is chosen, and these participants are asked to record the number of times that they lost their tempers in the two weeks prior to the course. After the course is over, the same participants are asked to record the number of times that they lost their tempers in the next two weeks. The following table lists the results of the survey. Using these data, test the claim at the 0.02 level of significance assuming that the population distribution of the paired differences is approximately normal. Let participants before completing the anger-management course be Population 1 and let participants after completing the anger-management course be Population 2 Number of Times Temper Was Lost during a Two-Week Period Before 88376473 12 4 84 3 36 4 4 6 3 11 4 54 After Copy Data Step 1 of 3: State…
A problem with polling is whether or not people are willing to answer honestly. If a question might be viewed as shameful or embarrassing (about politics, sexual activity, etc.), they may be reluctant to answer honestly. A potential solution to this is the following: let's suppose that 'YES’ is the embarrassing or socially shameful answer. Give the people you are polling the following instructions: flip a coin privately, and if it comes up heads, you must answer honestly. However, if it comes up tails, you must answer 'YES’ regardless of what the truth is. This gives people л plausible deniability about why they answered yes, if pressed. Again, let p, be the fraction of people who said 'YES'. Let p be the probability that a randomly selected person says YES’. Let q be the probability that a person’s true answer is 'YES’. Note л again, we have that the expected value of p,, is p, but we are actually interested in N measuring q.
Is the national crime rate really going down? Some sociologists say yes! They say that the reason for the decline in crime rates in the 1980s and 1990s is demographics. It seems that the population is aging, and older people commit fewer crimes. According to the FBI and the Justice Department, 70% of all arrests are of males aged 15 to 34 years.† Suppose you are a sociologist in Rock Springs, Wyoming, and a random sample of police files showed that of 34 arrests last month, 21 were of males aged 15 to 34 years. Use a 1% level of significance to test the claim that the population proportion of such arrests is the city different from 70%. Solve the problem using both the traditional method and the P-value method. Since the sampling distribution of p̂ is the normal distribution, you can use critical values from the standard normal distribution as shown in the table of critical values of the z distribution. (Round the test statistic and the critical value to two decimal places. Round the…
Ms Loom is writing a quiz that contains a multiple-choice question with five possible answers. There is 30% chances that Ms Loom will not know the answer to the question, and she will guess the answer. If Ms Loom guesses, then the probability of choosing the correct answer is 0.20. What is the probability that Ms Loom really knew the correct answer, given that she correctly answers a question?
. According to the Centers for Disease Control, 8% of Americans have diabetes. If an American is selected at random, determine the odds in favor of the this person having diabetes.
Professor Ramos will participate in a lottery that will be played by five hundred participants. He buys a ticket for five dollars. If the lucky randomly selected winner gets one hundred dollars as a prize, what would Ramos' expected winnings or losses be?
Suppose that 60% of voters oppose a new ordinance. If we plan to randomly select 20 registered voters, find the probability that at least 13 of the voters in the sample will oppose the ordinance. You may assume sampling with replacement.
Just before a referendum on a school budget, a local newspaper polls 424 voters to predict whether the budget will pass. Suppose the budget has the support of 54% of the voters. What is the probability that the newspaper's sample will lead it to predict defeat?
Your company uses a pre employment of the test to screen applicants for the job of repairman.the test is passed by 60%of the applicants.Among those who pass the test 80% complete training successfully. In an experiment,a random sample of applicant who do not pass the test is also employed. Training is successfully completed by only 50%of this group.if no pre Employment test is used,what percentage of applicants would you expect to complete training successfully?
Suppose 20% of business majors major in finance. You take a random sample of 3 business majors. What is the chance that only one of them majors in finance? (write the answer in three decimal places)

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