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The focus of the field of statistics is studying data and information while determining how to interpret this information in useful ways. The primary goal of statistics is to collect reliable information and interpret it to learn more about the world around us and the people and things in it. Statistical methods are often applied to questions about nature and society to learn more about them and can also be applied in many different situations and contexts.
You may encounter statistics everywhere: in the media, perhaps in your job, at the doctor’s office, etc. Knowing statistics is important when looking at an exam grade to understand how well you did relative to the rest of the class. It is also important when your doctor prescribes a medication and explains that the drug has a 5% chance of a specific side effect.
Knowing more about statistics and how they are created and analyzed can allow you a greater understanding of these situations and provide a greater ability to interpret the significance of the statistics that you come across.
The many methods of gathering information and statistics include:
IN CONTEXT
While you could disclose information simply by observation, using the experimental method is beneficial because it permits us to establish whether there is a cause-and-effect relationship between two things. Take a look at these examples of situations that benefit from using the experimental method:
By using the experimental approach with these scenarios, you would have the ability to determine whether one element of each pair is causing the other element.
- You would expect that the more time you spend studying, the better your grades are likely to be. The experimental method allows you to track that to see if you are right. Record how much time you spend studying, then record the grades that you get and see if you can determine any kind of cause-and-effect relationship between the two.
- You would expect that the fewer calories you consume, the more weight you will likely lose. You would engage in the experimental method by tracking those calories and tracking the weight.
- You would expect that the slower you drive, the better gas mileage you’re going to get. How will we engage in the experimental method with that? You would simply track how fast you drive and then track what kind of gas mileage you received.
The elements that are being changed or observed are called variables. The explanatory variable is the element that the experimenter changes. The response variable is the element that is observed that may be changing in response to the explanatory variable.
The idea here is that the experimenter will keep careful records and measurements as the experimenters make changes to the explanatory variable, and observe how the response variable responds or fails to respond.
The experimental method has eight steps. You are going to go through these eight steps using the example of taking a specific medication to reduce the symptoms of a cold.
Maybe you’ve had a cold for a while, and you’re trying to figure out what medication is going to help you feel better. By using the experimental method, you could figure out a methodical way of tracking these results.
Take a look at other examples besides the medication and the cold symptoms. Say you’re interested in getting to work a little bit earlier than you have been. You’ve been running late, and your boss is kind of frowning at you every time you walk in the door 5 minutes late.
To change that, you’re interested in setting your alarm clock a little bit earlier to see if that makes a difference in terms of when you arrive at work. In a case like this, by setting the alarm clock just a few minutes earlier every day, you can determine whether or not you would get to work earlier as a result.
Method | Example |
---|---|
Experimental Method | Make incremental changes to the alarm clock and record when you get to work. |
Observational Method | Try to get up earlier and then notice if the boss stops yelling at you for being late. |
Here, it would be important to use the experimental method rather than an observational one, as you would be able to determine just how much earlier you had to get up in order to get to work earlier, rather than simply noticing a trend or maybe getting to work early by chance. The experimental method helps us realize if there is a strong cause-and-effect relationship between two things, whereas just observing still leaves room for speculation on whether or not two things do have a cause-and-effect relationship.
Sometimes we come across explanations of experiments that have already been done, such as studies conducted on new over-the-counter drugs or surveys regarding how many people consider a particular politician trustworthy. It can be useful in better understanding the experiment and its results if you can recognize the explanatory and response variables.
So let’s take a look at a couple of different examples here to see if we can identify explanatory and response variables.
Source: THIS TUTORIAL WAS AUTHORED BY DAN LAUB FOR SOPHIA LEARNING. PLEASE SEE OUR TERMS OF USE.