Why or why not? In Norway, the term leadership has been with us for seventy years. But its a different matter for polling organizations like Pew Research Center. You never know whatyoure gonna get. (a) Whats your estimate for the probability of heads? Explain your reasoning. Justify your answer. Businesses with little person-to-person contact with customers can expect response rates at the low end of this scale. What is the probability that a randomly selected student uses YouTube regularly given that they have a Facebook profile. Who eats breakfast? In each of the following situations, state whether or not the given assignment of probabilities to individual outcomes is legitimate, that is, satisfies the rules of probability. A recent survey suggests that 85% of college students have posted a profile on Facebook, 73% use YouTube regularly, and 66% do both. Get plagiarism-free solution within 48 hours. (a) Roll a die and record the count of spots on the up-face: P(1) = 0, P(2) = 1/6, P(3) = 1/3, P(4) = 1/3. 73. A study by the National Center for Health Statistics found that the BMI of American young women (ages 20 to 29) is approximately Normal with mean 26.8 and standard deviation 7.4.23BMI (2.2) People with BMI less than 18.5 are often classed as underweight. (b) Construct a Venn diagram to represent this setting. For many people, majority is a word so common that they rarely have to think twice about what it means. (b) Find $P(F | D) .$ Explain what this value means. Online BMI calculators allow you to enter weight in pounds and height in inches. Sampling senators The two-way table describes the members of the U.S. Senate in a recent year. Although the Centers writers cant quantify all of the uncertainties when summarizing survey data, they seek to acknowledge them. For instance,question wordingcan introduce error or bias into the findings of opinion polls. MySpace versus Facebook A recent survey suggests that 85% of college students have posted a profile on Facebook, 54% use MySpace regularly, and 42% do both. Illegal music downloading has become a big problem: 29% of Internet users download music files, and 67% of downloaders say they dont care if the music is copyrighted.15 What percentof Internet users download music and dont care if its copyrighted? Inspecting switches A shipment contains 10,000 switches. Box of chocolates According to Forrest Gump, Life is like a box of chocolates. At the next stage, the person called either does or does not pledge to contribute, with conditional probabilities that depend on the donor class the person belongs to.Finally, those who make a pledge either do or dont actually make a contribution. 71. A recent survey suggests that 85% of college students have posted a profile on Facebook, 54% use Instagram regularly, and 42% do both. The geometric distributions You are tossing a pair of fair, six-sided dice in a board game. Choose a Canadian at random and ask, What is your mother tongue?. Of these, only 1.7% enter major league professional sports. (c) Consider the event that the randomly selected . The probabilityis 0.13 that the person chosen did not complete high school, 0.29 that the person has a high schooldiploma but no further education, and 0.30 that the person has at least a bachelors degree. Academic Problems. Submit your documents and get free Plagiarism report. This site uses cookies. We canlearn which model is actually accurate for a particular die only by rolling the die many times. But, by being aware of recent survey response rate metrics, along with key influencing factors, you can establish some realistic expectations. People's attitudes disappear. In the first article, a majority of Canadians refers to 72%. The algorithms compare the questions in the surveys to see to what extent the questions have an overlapping meaning. Can we then trust the management researchers findings? Get started for free! 1:36. using the two events of interest that you chose in (b). Here is the assignment of probabilities to the sum ofthe numbers on the up-faces when two dice are rolled: The most common bet in craps is the pass line. A pass line bettor wins immediately if either a 7 or an 11 comes up on the first roll. Professor and management researcher Jan Ketil Arnulf at BI Norwegian Business School is not at all sure that we can. (b) Find P(a good chance). Despite widespread speculation and anecdotal claims about the disruptions and negative impacts of the Covid-19 pandemic on the quality of a college education, a new national survey reveals that the majority of students still rated their educational experiences this fall asexcellent or very good.. (d) Find the probability of the event described in (c). Role-playing games Refer to Exercise 39. Many students forced online are displeased with the quality of their schooling and unhappy about their lives.. Everything you need for your studies in one place. What is the probability that the chosen student eats neither fish nor eggs? (b) What percent of people who are lactose intolerant are Asian? (Hide this section if you want to rate later). Why? (b) If the person selected said some chance but probably not, whats the probability that the personis female? We also use different external services like Google Webfonts, Google Maps, and external Video providers. on a business website), or has just completed an interaction, can deliver response rates as high as 83%. Testing the test Are false positives too common in some medical tests? (c) Consider the event that the randomly (a) Assuming that there are 20 million college students, make a two-way table for this chance process. (a) Make a tree diagram to represent this setting. (2) I can decide how my dailywork is organized, within certain limits. Tossing coins Refer to Exercise 40. )$$\begin{array}{ll}{\text { (a) } P(F | A)=0.40} & {\text { (d) } P\left(A^{C} | F\right)=0.40} \\ {\text { (b) } P\left(A | F^{C}\right)=0.40} & {\text { (e) None of these }} \\ {\text { (c) } P\left(F | A^{C}\right)=0.40}\end{array}$$, Suppose a loaded die has the following probability model: If this die is thrown and the top face shows an odd number, what is the probability that the die shows a 1? A large medical trial assigned 1649 women to take either strontium ranelate or a placebo each day. The standard deviation of the survey responses is a measure of the spread or range of scores. Urban voters In the election described in Exercise 84, if the candidates predictions come true, whatpercent of her votes come from black voters? Show your work. (c) What is the probability that a Canadians mother tongue is a language other than English or French? The rest mainly used PCs. What percent of the overall vote does the candidate expect to get? (a) Find $P(B | M)$ . (a) Draw a tree diagram that shows the sample space of this chance process. Brand Recognition: Surveys distributed by well-known, recognized brands tend to attract better response rates than those carried out by unknown organisations. Find the probability that the student uses MySpace regularly. He recently published a study that challenges the method used by management researchers. Late shows Some TV shows begin after their scheduled times when earlier programs run late.According to a networks records, about 3% of its shows start late. Here is the distribution of responses, combining many separate languages from the broad Asia/Pacific region:6 Language: English French Asian/Pacific Other Probability: 0.63 0.22 0.06 ? Consider events D: is a democrat, and F: is female. Simplicity and Size: Complex, lengthy surveys involving long questions with bewildering answer choices will get far lower response rates than simple surveys with minimal questions. students still found their college experiences during the pandemic to be worthwhile, but many now have doubts about whether they will finish their degree. All 36 outcomes are equally likely. Heres the breakdown of those saying the quality of their educational experiences was excellent or very good.. All you are left with is semantic relationships, according to Arnulf. In surveys with multiple questions on the same topic, patterns of similarities occur which will determine the statistics in the answers. \text { (b) } 0.32 \text { (c) 0.16. A study by the National Center for Health Statistics found that the BMI of American young women (ages 20 to 29) is approximately Normal with mean 26.8 and standard deviation 7.4.23BMI (5.2) Suppose we select two American young women in this age group at random. Define events T: person is over 6 feet tall,and B: person is a professional basketball player. They also identified 50of the healthy patients as having the condition. A recent survey suggest that 85% of college students have posted a profile on Facebook, 73% use You Tube regularly, and 66% do both. (a) What percent of calls result in a contribution? Find the probability that the student uses MySpace regularly. In the United States(ignoring other groups and people who consider themselves to belong to more than one race), 82%of the population is white, 14% is black, and 4% is Asian. (a) Assuming that there are 20 million college students, make a two-way table for this chance process. Which of the following statements is appropriate for describing the 40% of people who went to the party? (b) Choose a college student at random and record gender and enrollment status: P(female full-time) = 0.56, P(male full-time) = 0.44, P(female part-time) = 0.24, P(male part-time) = 0.17. Show your work. Define events J: getting ajack, and R: getting a red card. Suppose we select a college student at random. Define event A: sum is 5. About 1 in 4 college students report experiencing academic difficulties from drinking, such as missing class or getting behind in schoolwork. (b) Find $P(B \cup M)$ . Surveys detect both the interviewee's degree of agreement - what is referred to as attitude strength - and how the subjects understand and use language. For example, the algorithm will show that today is Tuesday means the same thing as tomorrow will be Wednesday, although the sentences do not share a single word between them. Crawl before you walk (3.2) At what age do babies learn to crawl? Refer to Exercise 49. The correlations in such surveys are often determined by language. This basic reality can create challenges for writers who want to summarize poll findings in a precise way. At the same time, the results highlight particular vulnerabilities that warrant attention. (3) I am not free to decide how my daily work is organized. Hereis a two-way table of the responses for three levels of education:240 Is there an association between level of education and freedom to organize ones work? (a) What is the sample space for this chance process? A four-sided die has faces with 1, 2, 3, and 4 spots. Otherwise you will be prompted again when opening a new browser window or new a tab. A recent survey suggests that 85% of college students have posted a profile on Facebook, 73% use YouTube regularly, and 66% do both. Follow the four-step process. Survey Invitation: When, where, and how you ask for a survey to be filled out is vitally important. in the table of the distribution. (b) What is the probability that a Canadians mother tongue is not English? Find the probability that the student use YouTube regularly. The less positive ratings for on-line instruction appear to be largely from students who were forced to go on-line during the pandemic and were no longer able to continue in-person education experiences. Get rich A survey of 4826 randomly selected young adults (aged 19 to 25) asked, What do you think are the chances you will have much more than a middle-class income at age 30? In each of the following situations, state whether or not the given assignment ofprobabilities to individual outcomes is legitimate, that is, satisfies the rules of probability. Sketch and shade the area of interest under a Normal curve. We will find the probability of a flush when 5 cards are dealt. Thetest is quite accurate but is not always correct. And those results are often not very surprising.This can for example tell us that people who like their job do not want to quit as often as people who do not like their job. Opinions expressed by Forbes Contributors are their own. answer choices .776 .904 .859 .824 Question 16 120 seconds Customer Thermometers 1-click survey will up your feedback game. Tossing coins Imagine tossing a fair coin 3 times. (b) If we select a student from the school at random, what is the probability that we choosea female? Treating low bone density (4.2) Fractures of the spine are common and serious among women withadvanced osteoporosis (low mineral density in the bones). What is this probability? Rank the following probabilities from smallest to largest. A mayoral candidateanticipates attracting 30% of the white vote, 90% of the black vote, and 50% of the Hispanic vote. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research. Facebook versus YouTube A recent survey suggests that $85 \%$ of college students have posted a profile on Facebook, $73 \%$ use YouTube regularly, and $66 \%$ do both. 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