these lines here has a 95% chance of containing the mean, okay?

Now of course, so this is a visual way of getting an idea of how confident

you should be in this line but, the whole point of using statistics is to

get an actual number, so, that it can make the decision for you about whether or

not this line is something that you want to pay attention to.

So, Tableau gives you those numbers as well.

So, the fastest way to do this, is if you hover over the line,

you'll see it actually gives you the equation for the best fit line.

I don't wanna go through the details of what the equation means.

I have included some resources with this video in

case you're interested in learning more.

There's certainly a lot more to learn and regression is very interesting.

But for right now, the main thing I want you to pay attention to

is that part underneath it that's called the P-value.

The P-value indicates how likely it is that the observed trend

happened by chance, or is indeed reliable.

The smaller the P-value,

the more likely it is that the conclusions that you would draw from looking at this

line are indeed reliable and something that you should trust.

Now the convention is that you should only trust trend

lines with P-values that are less than either 0.05, or 0.01.

Now when you're using a P-value of 0.05,

that means that there's a false positive rate of 5% or less.

If you're using a P-value of 0.01,

that means there is a false positive rate of 1% or less.

So that gives you an idea of the things that you should consider important for

your analysis.

Now, this particular line has a P-value of 0.07.

So one way to decide whether or not this effect is important for your analysis

would be to say well, it's not under 0.05, so I'm not gonna worry about it too much.

Maybe I'll put it in the back of my head, but I'm not gonna worry about it too much.

So now that you know how to do this, I wanna do this for

each one our job sub categories.

And before we do that I wanna go ahead and get rid of these

confidence intervals because it will make the graphs look pretty busy.

So if you right click on the line and go to Edit Trend Lines and

you see here that show confidence bands is clicked.

I want you to unclick that and press OK.

And now you see that there's no confidence interval.

So let's go ahead and let's add trend lines to these other graphs.

And now we're gonna look at these lines for

each individual subgroup, job title subgroup.

So now take job title subgroup and

bring it over to color on the marks card and do that for each of your graphs.