Deductive thesis statement

Now imagine that a few weeks later you ate strawberries and soon afterwards your lips again became swollen. The following month, you ate yet another dish of strawberries, and you had the same reaction as formerly. You are aware that swollen lips can be a sign of an allergy to strawberries. Using induction, you conclude that, more likely than not, you are allergic to strawberries. You may also find that some discussions of induction use the word premises to refer to data.

Inductive reasoning can never lead to absolute certainty. Instead, induction allows you to say that, given the data and the warrant, the claim more likely than not is true. Because of the limitations of inductive reasoning, a claim will be more credible if multiple lines of reasoning are presented in its support. When applying inductive reasoning, always keep in mind that the better and more complete the data and the more relevant the warrant, the likelier it is that the claim will be credible. For example, medical researchers report their results with greater confidence if they can say the following about participants in a study: that the participants were a representative sample and that the sample size was a large one.

The larger and more representative a sample, the less likely it is that the results arose out of random variation.

Thesis Statements

Also keep in mind that the results of inductive thinking can be skewed if relevant data or warrants are overlooked. In the previous example, inductive reasoning was used to conclude that I am likely allergic to strawberries after suffering multiple instances of my lips swelling. Would I be as confident in my claim if I was eating strawberry shortcake on each of those occasions?

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It is reasonable to assume that the allergic reaction might be due to another ingredient besides strawberries? This example illustrates that inductive reasoning must be used with care. When evaluating an inductive argument, consider:. One type of inductive argument involves reasoning about causes and effects.

Deductive Essay Writing Tips from Valedictorians

If events regularly occur within the same time frame, an observer may conclude that one event causes another. For example, April has a reputation for rain; during this rainy month, income taxes come due. Still, the rain does not cause taxes to come due; nor is tax season the cause of spring showers. Confusing correlation with causation may cause great harm, as when parents stop vaccinating children because of a weak correlation between vaccine administration and the age at which children are typically diagnosed with autism.

A perceived pattern has been mistaken for causation.


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Since humans are prone to see patterns, claims about causation need to meet a scientific standard that goes well beyond reliance upon intuition. Generalization may be the approach that people have in mind when they think of inductive reasoning. To generalize, a person begins with particular observations and then pools those individual observations in order to draw a conclusion that accounts for all the individual cases. For example, a person observing swans on a number of occasions may notice that each swan is white. Generalizations rarely lead to absolute certainty.

They are subject to revision because they are based on a sample reported swan sightings rather than on direct observation of all possible evidence a tally of every swan in the world.

Deductive essay

Because the generalization is based on a sample, it could be falsified any time additional evidence turns up that is not consistent with the claim. As a matter of fact, there are black swans in Australia.

However, if the sample is large enough and representative of the target population, inductive generalization can be a very powerful—even essential—tool. All raccoons are omnivores. This animal is a raccoon. This animal is an omnivore. If the first statement is true All raccoons are omnivores and the second statement is true This animal is a raccoon , then the conclusion This animal is an omnivore is unavoidable.

If a group must have a certain quality, and an individual is a member of that group, then the individual must have that quality. Unlike inductive reasoning, deductive reasoning allows for certainty as long as certain rules are followed. Here conclusion means the claim that is the outcome of deductive reasoning.

The first premise is checked against the second premise in order to infer a conclusion. A formal argument may be set up so that, on its face, it looks logical.

Distinguishing Between Inductive and Deductive Reasoning (English III Reading)

However, no matter how well-constructed the argument is, the premises must be true or any inferences based on the premises will be unsound. Inductive reasoning often stands behind the premises in a deductive argument. That is, a generalization reached through inductive reasoning is the claim in an inductive argument, but a speaker or writer can turn around and use that generalization as a premise in a deductive argument.

Premise induced : Most Labrador retrievers are friendly. Premise deduced : Kimber is a Labrador retriever. Conclusion: Therefore, Kimber is friendly. In this case we cannot know for certain that Kimber is a friendly Labrador retriever. The structure of the argument may look logical, but it is based on observations and generalizations rather than indisputable facts. One way to test the accuracy of a premise is to determine whether the premise is based upon a sample that is both representative and sufficiently large, and ask yourself whether all relevant factors have been taken into account in the analysis of data that leads to a generalization.

Another way to evaluate a premise is to determine whether its source is credible. Are the authors identified? What is their background? Was the premise something you found on an undocumented website? Did you find it in a popular publication or a scholarly one? How complete, how recent, and how relevant were the studies or statistics discussed in the source?


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The following argument is based upon research published in a peer-reviewed medical journal. The author has an extensive background in public health including a medical degree and doctorate in medicine. The vaccination coverage required to establish herd immunity against influenza viruses. Judging from what we know about credible sources, we can feel confident using the following the following argument in our own research even though it is based upon inductive premises. The source is highly credible in part because it is written by an expert for experts.

That fact may make a source a challenging read for ordinary readers. It is a medical study based on sufficient , representative , and relevant data that has been carefully analyzed by someone highly qualified in the field. Depending on the nature of an assignment and whether a course is for majors or non-majors, you may be allowed to use some sources that report on studies rather than the original studies themselves. However, you should consult the primary sources whenever possible.

Consider this highly unscientific poll conducted by a TV news station. Is she in fact out of touch at all? An important thing here is that the final draft should be both clarified and featuring a sharp focus that are the two main characteristics of a deductive essay that brings a fine grade. To write a deductive essay that demonstrates your prowess in a subject you have to embed such parts in your paper as Premises, Evidence and Conclusions.

What are Premises?