Sample size öf an experiment affects the probabilities in a probability model. Be sure to discus es in terms of them being realistic estimates of the probability of an event.
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- part 4 5 6Fake News According to Pew Research, 64% of American believe that fake news causes a great deal of confusion.Twenty Americans are selected at random. • We can expect out of Americans to believe fake news causes a great deal of confusion. • The standard deviation is (Round to the nearest hundredth. • The distribution is Use technology (graphing calculator, Microsoft Excel, or Google Sheets) to find the following probabilities. Enter the probability only. Round to the 4th decimal place, if necessary. What is the probability that: • Exactly 12 believe fake news causes a grbat deal of confusion? • Less than 16 believe fake news causes a great deal of confusion? • No more than 11 believe fake news causes a great deal of confusion? • More than 7 believe fake news causes a great deal of confusion? CheckPlease answer this question. Show work! Thank you!
- Polling As mentioned in the chapter, opinion-polling organizations contact their respondents by sampling ran-dom telephone numbers. Although interviewers now can reach about 62% of U.S. households, the percentage ofthose contacted who agree to cooperate with the surveyhas fallen from 43% in 1997 to only 14% in 2012 (PewResearch Center for the People and the Press). Eachhousehold, of course, is independent of the others.a) What is the probability that the next householdon the list will be contacted but will refuse tocooperate? b) What was the probability (in 2012) of failing to con-tact a household or of contacting the household but not getting them to agree to the interview?c) Show another way to calculate the probability inpart b.need asap. complete solutions pleaseYou may need to use the appropriate appendix table or technology to answer this question. A market research firm conducts telephone surveys with a 26% historical response rate. What is the probability that in a new sample of 600 telephone numbers, at least 150 individuals will cooperate and respond to the questions? In other words, what is the probability that the sample proportion will be at least 150 600 = 0.25? Step 1 Recall that a sampling distribution of p is a discrete probability distribution but can be approximated by a normal distribution when np ≥ 5 and n(1 − p) ≥ 5, where n is the sample size and p is the population proportion. Let p be the population proportion of people who respond to questions in telephone surveys. Here, it is given that 26% of people respond to questions in telephone surveys. Converting this percentage to a proportion gives p = . There is a sample of 600 telephone numbers, so n = .
- Below is a partially complete probability model. Outcome 0.5 1 1.5 4 Probability 0.35 0.2 0.15 ? Enter the probability for the final outcome. Find the expected value of the probability model.In Bayesian statistics, a 90% credible interval (or Bayes interval) covers the true parameter with (subjective) probability 90%. True FalseWhat is the significance of the mean of a probability distribution? Choose the correct answer below. OA. It gives information about how the outcomes vary. OB. It is the expected value of a discrete random variable. OC. It can never be negative. OD. It represents the most likely possible outcome. C
- A description of the distribution of the values of a random variable and their associated probabilities is called a probability distribution random variance random variable expected valuePlz answer the question in 10 minutes plzzzFind the expected value for the random variable whose probability function graph is displayed here AP 0.5- 0.4- 0.3- 0.2- 0.1- 0- 1 2 34 5
