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Two-way tables Video transcript Shira's math test included a survey question asking how many hours students had spent studying for the test. The graph below shows the relationship between how many hours students spent studying and their score on the test.

Shira drew the line below to show the trend line example in the data.

Identify Trend Lines on Graphs - Expii

Assuming the line is correct, what does the line slope of 15 mean? So let's see.

Let's look at the scatter plot used in this explanation to show a trend line. The data is recorded below. We're going to graph these points on a scatter plot. This graph has a positive correlation.

The horizontal axis is time studying in hours. The vertical axis is scores on the test.

Choosing the best trendline for your data

And each of these blue dots represent the time and the score for a given student. So this student right over here spent-- I don't know, it looks like they spend about 0. And they didn't do too well on the exam.

They look like they got below a 45, looks like a 43 or a 44 on the exam.

The 5 Different Trend Lines Explained

And what Shira did is try to draw a line that tries to fit this data. And it seems like it does a pretty good job of at least showing the trend in the data.

Now, slope of 15 means that if I'm on the line-- so let's say I'm here-- and if I increase in the horizontal direction by trend line example there, I increase the horizontal direction by I should be increasing in the vertical direction by And you see that.

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Now, let's see which of these are consistent. In general, reviews about real binary options who didn't study at all got scores of about 15 on the test. Well, let's see.

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This is neither true-- these are the people who didn't study at all, and they didn't get a 15 on the test. And that's definitely not what this 15 implies.

Trend Lines

This doesn't say what the people who didn't study at all get. So this one is not true.

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That one is not true. Let's try this one.

If one student studied for one hour more than another student, the student who studied more got exactly 15 more points on the test. Well, this is getting closer to the spirit of what the slope means.

But this word "exactly" is what, at least in my mind, messes this choice up. This is just saying that this is the general trend that this line is seeing.

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  • Около пятнадцати тысяч этих созданий населяют Южный полуцилиндр - все пространство отсюда до окружности южной полярной чаши.

So it's not guaranteed. For example, we could find trend line example student here who studied exactly two hours. And if we look at the students who studied for three hours, well, there's no one exactly at three hours.

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But some of them-- so this was, let's see, the student who was at two hours. You go to three hours, there's no one exactly there. But there's going to be students who got better than what would be expected and students who might get a little bit worse.

Notice, there's points above the trend line, and there's points below the trend line.

Interpreting a trend line

Let's try this choice. In general, studying for one extra hour was associated with a point improvement in test score.

I will try to explain the differences and when to use them.

That feels about right. In general, studying for 15 extra hours was associated with a 1-point improvement in test score.

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Well, no, that would get the slope the other way around. So that's definitely not the case. So let's check our answer. And we got it right.

Additional Resources Trend Lines As technical analysis is built on the assumption that prices trend, the use of trend lines is important for both trend identification and confirmation. A trend line is a straight line that connects two or more price points and then extends into the future to act as a line of support or resistance. Many of the principles applicable to support and resistance levels can be applied to trend lines as well. It is important that you understand all of the concepts presented in our Support and Resistance article before continuing on. Definition Uptrend Line An uptrend line has a positive slope and is formed by connecting two or more low points.