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Coursera - Practical machine learning - Quiz 2
Week 1 Practice Quiz Spreadsheet. Sum the daily returns to calculate annual continuously compounded returns for Give each result in percent, rounded to two digits to the right of the decimal place — for example, Solve: What is the Dow Chemical Annual return? Use this spreadsheet to answer the question. Round your answer two digits to the right of the decimal place — for example,. Excel Problem Type: Identifying the maximum value in a column and sorting multiple columns while preserving rows.
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February 9, April 28, February 1, 4. Question: How many days out of the trading days in did Dow outperform Dupont? May 20, February 4, May 10, 6. What is the Sharpe Ratio for Dupont stock for ? Give the answer to two digits to the right of the decimal place.
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Try the Course for Free Transcript Okay, so let's look at the last ten questions. Question 21, what ethical aspect is definitely violated? Well, the right answer here of course is respect. Students weren't even aware that they were taking part in a research study. So they did not autonomously and voluntarily decide to take part in the study. And of course they were not well informed. Question Suppose the lecturer does not find the expected results and decides not to reject the hypothesis yet, but to reject the assumption of valid and reliable measurement instead. By whom was this approach critically discussed? Well the right answer here is Quine of the Duhem Quine thesis.
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Who said it is always possible to keep a hypothesis alive by rejecting a background or supporting assumption or hypothesis. This is in reply to Popper who favored falsification. In which of course for the reason I just said doesn't work according to Quine. Kuhn also talked about hypotheses that should have actually been rejected, but stayed around too long. But this is always in the context of certain paradigms and paradigm shifts. Question 23, the choice to measure engagement with a questionnaire is associated with the deduction phase in the empirical cycle. In the induction phase, you transform observations into hypotheses, a general rule. In the deduction phase, you use this general rule in combination with decisions about operationalization, manipulation, a research design to deduce specific outcomes, specific observations that form your predictions.
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In the testing phase you actually collect the data and see whether your predictions are confirmed. So the right answer here was deduction. Because a higher score is not unambiguously associated with more engagement. That terms polytomous and dichotomous are associated with a number of response options and are not relevant here. Question 25, suppose the research hypothesis is not confirmed by the results and the lecturer decides not to publish the research for that reason. This is an example of.
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Well, you could say publication bias. It is that, but in this course in the videos I made a further specification, the file-drawer problem, for failures to publish reports based on the researchers decision. Now I realize and I saw that in the forum there's been a big discussion about this. And the, the use of this term is, is not unambiguous. Many people use it in different ways. But in this course, it's presented in the way I just described, and also the question performs very nicely in terms of psychometric qualities. So, I decided to leave this one in, and count as the only right answer the file-drawer problem. If the engagement questionnaire is very unreliable, then the next time any particular students complete the questionnaire, what will happen to the new score?
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Well consider what happens if you stand on a very unreliable weight scale a couple of times. Well you would expect large variations every time. This is basically the definition of unreliable. So the right answer is by a large degree. Question 27 what kind of variable is type of student? It's not monotone. We discussed the term monotone item, but not monotone variable here.
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This is not relevant. It's not an experimental variable, because we didn't manipulate whether somebody is a premaster or bachelor student. Individual-differences variable is the right answer. It's a characteristic that participants bring with them into the research study. What is the measurement level of the variable educational degree? Well, it could be nominal because we specified different classes or categories, you can see that hear. Secondary you get education, bachelor, or master's degree.
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And of course these build on each other, so there is actually an order to these degrees. You can't say anything about the differences between these levels. Okay, so moving on to question Now this was a big mess of a question because you actually didn't have the relevant background information. The on campus students were privy to extra material explaining this in more detail. So we decided to award you a point for whatever option you choose. But to give you an idea of what my reason was here, if you look at these statistics you can see that the minimum value was one and the maximum value was three, and that missing values were specified. If you go back to the description of the variable sex in the research description you. You can see that there were two categories, male and female. No third category. Don't want to say or anything like that. So there should be only two values. And the most obvious coding would be one and two given these values here. So three is strange, is weird.
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And because its adjacent to the number two on your keyboard its very likely a data entry error. It could maybe be a missing value misspecification. But it would be very, well basically stupid to use the value three as a missing value. For example if people indicated they were both male and female and you wanted to indicate that you can't use these these data. They should be considered missing. That's a really bad idea. Why not use nine or zero or minus one, or something that's can't be mistaken or, or, or isn't easily mistyped and therefore erroneously considered a missing value. So, the actual right answer was, a data entry error. A coding error is very unlikely here, because why would you recode that? Unfortunately people were thrown off by these data, the mean and standard deviation which is weird information to provide for a categorical variable. But my idea was that it was a really quick way to see that the, the, the average was kind of high but, but you should have been able to to answer this question without this information.
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It was made up. Not really relevant. The last question, number The benefit of a syntax-file, amongst other things, is documentation of. Well of course it's documentation of the statistical operation performed on the data. You don't want to include the actual materials, the actual questionnaires and stuff like that in your syntax file. So the right answer here was the first option and that's it.
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Practice: Minds, Brains and Computers Suilin has a human mind, but a tennis ball does not. This is a fact. Tick all options that apply Think thoughts about thoughts. Be in states such as thinking, believing, desiring that are about things. Bounce up and down. Substance dualism or Cartesian dualism is the view that: Mind and matter are very different kinds of things. We can never know anything for certain. We can never know whether our minds and our bodies are different kinds of things. Minds and bodies are made of the same type of substance, but have different properties. Princess Elisabeth of Bohemia objected to Descartes dualism because: It is unclear how a non-physical thing can cause changes in a physical thing. Everything is only made out of one kind of substance.
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We can never know for certain whether a theory is true. A malevolent demon could be deceiving us into thinking substance dualism was true. From what Suilin has said so far, which of the following is the best definition of the identity theory of mental states? Brain states are identical to mental states. Substance dualism is false. We cannot tell the difference between mental states and brain states. Mental states correspond to brain states. Which of the following claims would a type-type identity theorist reject?
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There could be two creatures in the same type of mental state, but different types of brain state. Every mental state is identical with some physical state. For every type of mental state, there is a type of physical state which is identical to it. An octopus might be in the same type of mental state as me, but in a very different type of brain state. There might be other species that have very different kinds of mental states to ours. Brain states and mental states seem like very different kinds of things. Hilary Putnam thought that we should understand mental states in terms of their… Function. Interaction with the brain. Intrinsic properties. In virtue of what, according to the functionalist, would it be possible for both an alien and a human—who have very different physical makeups—to be in a state of pain? They both can be in mental states that have the functional role associated with pain.
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Their physical bodies are both associated with the same kind of immaterial mind. They both ultimately evolved from the same evolutionary ancestors. They both are ultimately constituted from the same fundamental particles described by physics. What, according to the functionalist, is the difference between things which merely have functional roles such as carburetors and things whose functional roles amount to their having a mind?
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The functional roles must have evolved to avoid predators. The functional roles must be possessed by material substances. The functional roles must be sufficiently complex. The functional roles must be possessed by immaterial substances. What must a computer do to pass the Turing test? Respond to questions in such a way that one cannot distinguish between it and a human being. Make as many errors performing calculations as a human being.
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Experience the world in the same way as a human being. Be subject to the same human rights as a human being. What is the difference between the syntactic properties of a symbol and the semantic properties of a symbol? The syntactic properties of a symbol pertain to its form whereas the semantic properties of a symbol pertain to its meaning or content. Symbols have syntactic properties, but sentences only have semantic properties Chinese languages such as Mandarin have syntactic properties, whereas European languages, such as English, only have semantic properties. Understanding logic and mathematics only involves recognising syntactic properties whereas understanding poetry only involves recognising semantic properties. What is the bearing of the hard problem of consciousness on functionalism? It is hard to produce functional analyses of things.
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It is hard to produce a computer that can pass the Turing test. Practice: Are Scientific Theories True? Providing a good analysis of available scientific data and observations. Providing a good story about the phenomenology of science: what it is like to do science. Providing a true story about what causes scientific data and observations. According to Duhem, how did ancient Greek astronomers view the status of their scientific claims? Sophisticated hypotheses that can explain the apparent celestial motion of the planets, but that do not necessarily provide a true description of their motion. Mathematical contrivances that fail to provide a good formula for predicting the celestial motion of the planets. Sophisticated hypotheses that can explain the apparent celestial motion of the planets, and that probably also provide a true description of their motion.
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