Below is a tree diagram representing a diagnostic or a screening tests. On this diagram, what is the probability assigned to the top branch linking "feature" with "positive"? Unknown status Known test result Positive Feature Negative Individual from a specific population Positive No feature Negative P(positive|feature) P(feature) P(feature|positive) O P(feature and positive) P(feature or positive) P(positive)
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- Q14) In two throws of a fair-die, what is the probablity of rolling an even number on the first or second throw? (Find TWO WAYS to calculate this probablity, a tree diagram may help)Four students are randomly selected from an algebra class and asked whether they suffer from math anxiety or no math anxiety. Make a tree diagram to show sample space.If a study determines the difference in average salary for subpopulations of mechanical engineers and civil engineers is NOT significant, then the subpopulations of mechanical and civil engineers are ________ different salaries. Guaranteed not to be earning 2.Earning very 3.Definitely earning 4.0Not earning
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- In a survey, 38% of the respondents stated that they talk to their pets on the telephone. A veterinarian believed this result to be too high, so she randomly selected 240 pet owners and discovered that 89 of them spoke to their pet on the telephone. Does the veterinarian have a right to be skeptical? Use the α=0.1 level of significance.A researcher uses an anonymous survey to investigate the study habits of American college students. Based on the set of 56 surveys that were completed and returned, the researcher finds that these students spend an average of 4.1 hours each week working on course material outside of class. For this study, the average of 4.1 hours is an example of a(n) _______.A cable company prepared four versions of a set of instructions for hooking up a TV. The company asked a sample of 1,600 people which one of the four forms was easiest to understand. In the sample, 425 people preferred Form A, 385 preferred Form B, 375 preferred Form C, and 415 preferred Form D. At the 5% level of significance, can one conclude that in the population there is a preferred form?