Deductive reasoning is a logical process that leads from broad concepts to conclusions. On the other hand, inductive reasoning starts with individual observations and leads to broad generalizations.
Deductive reasoning is sometimes known as top-down reasoning or deductive logic.
Deductive reasoning is frequently mixed up with inductive reasoning. On the other hand, inductive reasoning concludes by moving from the particular to the general.
Deductive reasoning: Definition
In deductive reasoning, you’ll frequently make an argument on a particular viewpoint. Then, by combining several premises, you can draw an inference or conclusion.
A premise is a statement that establishes the foundation for a theory or broad notion. It is a widely recognized idea, fact, or rule. Conclusions are claims that are backed up by evidence.
Arguments using deductive logic
You’ll frequently start with a premise and add another in a basic deductive logic argument. Next, based on two essential premises, you conclude. It is known as the “premise-premise-conclusion” structure.
Examples of deductive logic arguments
Premise: Every insect has the same number of legs: six.
Premise: Spiders have a total of eight legs.
Conclusion: Consequently, spiders aren’t insects.
Premise: When an acid is added to a blue litmus paper, it becomes red.
Premise: After I poured some liquid on the blue litmus paper, it became red.
Conclusion: Consequently, the liquid has an acidic pH.
Validity and reliability
Two factors for evaluating deductive reasoning arguments are validity and soundness.
The validity, in this case, refers to the relationship between the premises and the conclusion. It is not to be confused with research validity.
The premises must logically justify and connect to the conclusion for an argument to be considered legitimate. However, the premises do not have to be true for an argument to be sound.
Valid (but false) deductive argument examples.
Flights are delayed if a rainbow appears.
Now there’s a rainbow.
As a result, flights have been delayed.
Chilli peppers are all hot.
Tomatoes are classified as chilli pepper.
As a result, tomatoes are hot.
Both of these points are well-made. Even if the premises are entirely false, they are connected so that you may reasonably derive the conclusion.
Your premises may be correct, but that does not ensure a correct conclusion in an invalid argument. For example, your conclusion could be correct by accident, but your argument is still faulty if it does not logically flow from the link between the assertions.
Invalid deductive argument examples.
Leopards have spots on their bodies.
My pet lizard is spotted.
As a result, my lizard is a leopard.
The White House is home to all US presidents.
The White House was Barack Obama’s home.
As a result, Barack Obama was elected President of the United States of America.
Both are incorrect because the validity of the premises does not always imply the truth of the conclusion. You arrive at the proper conclusion in the second case, but both arguments have the same erroneous format.
Only valid arguments with truthful premises are considered sound. All erroneous arguments are unsound.
You’re sure to reach a correct conclusion if you start with valid premises and a sound argument.
Sound deductive reasoning examples
When the weather is bad, flights are delayed.
Right now, we’re dealing with some severe weather.
As a result, flights have been delayed.
All fruits include seeds and are developed from flowers.
Tomatoes are made up of seeds and are formed from flowers.
As a result, tomatoes are considered fruits.
The use of deductive reasoning in research
Deductive reasoning is widely applied in scientific studies, mainly connected with quantitative research.
You may have come upon the hypothetico-deductive technique while doing research. It’s a scientific approach for determining whether real-world facts support your theories.
The approach is employed in both academic and non-academic research.
Deductive research problem example.
You work for a huge insurance company as an internal researcher. The company is now battling a rising degree of employee disengagement, and you’ve been entrusted to provide a solution.
The following are typical steps in doing deductive research:
Your theories must, above all, be disprovable. If they’re not, you won’t be able to tell whether your findings back them up.
Deductive research method example
You believe that switching from a 5 to a 4-day workweek (without a pay cut) will aid in the reduction or prevention of disengagement by boosting employee well-being.
Your major hypothesis is as follows: Employee well-being will increase by shifting to a 4-day workweek. According to your null hypothesis, there will be no change in staff motivation before and after the modification.
Before and after the modification, you conduct monthly verifications to get data on employee satisfaction. You see a 25% boost in employee happiness following the modification in the workweek when you analyze the data.
You use a statistical test to determine that your findings are statistically significant. You reject the null hypothesis and conclude that your findings confirm your hypothesis.
The difference between inductive reasoning and deductive reasoning
Deductive reasoning is done from the top-down, whereas inductive reasoning is done from the bottom up.
Deductive reasoning begins with broad concepts and progresses through inferences to conclusions. First, you create a hypothesis based on theories. Then, you verify that hypothesis through inferential statistics and conclude based on empirical evidence.
Because you start with observations and work your way up to a theory, inductive reasoning is also a hypothesis-generating strategy. It’s an exploratory technique that’s frequently used before conducting deductive research.
Most research initiatives use both inductive and deductive reasoning methodologies in practice.
Ans. Comma is a punctuation mark that indicates a pause between sections of a sentence or in a sequence of items.
Ans. Commas are generally used to signify a list of items or a change between different sentence sections.
Ans. A comma adds clarity to your writing and helps break large sentences, making them easier to read.
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