I still need a wand.

And who owned that wand?

George! You gart whad a wand?

I call it the wizard's wand. Subtle.

The wand chooses the wizard, Mr. Potter.

I remember every wand I've ever sold, Mr. Potter.

There's no magic wand that's going to make it disappear.

You're nothing but a coward, hiding behind a magic wand!

I take up my wand and I utter the magic words

But remember the wand, the infra red meter, runs a little hot.

So we could treat everyone's measurement with the wand as variable X1.

Notice that this method will also reveal the bias in the wand measurement.

It gave her a great excuse to wear a sparkly dress and carry a wand.

How do we assess whether, this instrument the wand is a reliable measure of body temperature?

It so happens that the phoenix whose tail feather resides in your wand, gave another feather.

So, let's go back to this example of measuring body temperature with the wand, that infra red meter.

So, a very simple example. If you wave the wand over my overhead, you got my body temperature.

So, the different ways that you can measure body temperature, and the wand tends to overestimate body temperature.

It is curious that you should be destined for this wand when its brother gave you that scar.

You get rid of the wand in the same way that the iPhone got rid of the physical buttons.

A material wand makes the building into a sort of Frank Gehry thing that reflects light in all directions.

So I had a bunch of student and assume I got their body temperature by using that infrared wand.

Just by looking at the mean difference between X1 and X2 we'll see that the wand runs a little hot.

A shooting star, that with the wave of a magic wand, and a flash of light, could let me see your smile again.

There's actually research to support a, a lot of nurses sort of anecdotal evidence that uh, the wand tends to run a little hot.

So, there's oral, there's internal um, but more recently there's something that, uh, people in the medical field and hospitals refer to as the wand.

Paul is the designer of this wand, and maybe its easiest for him to come over here and tell me in person what's going on.

It was really humbling to see for the first time, to really understand that even if I could have taken a magic wand and fixed everything,

And the reason for this is this sample distribution was taken by going to, going around to a 100 people, healthy people, and using this new infrared wand ah, thermometer.

We can measure body temperature with the wand but then, we can also measure body temperature with a second method that is established as reliable and valid, for example, using an oral thermometer.

So the wand is an infrared meter, they look something like this and, and what a nurse will do is just wave it over the patient's forehead and it will read out body temperature.

Now you notice that there's one more thing sitting on the table, and you grab it, and it's a plastic wand like this and you dip it in soap and you make a bubble out of the soap.

The idea behind classical test theory is that these raw scores that I've been talking about, so the, the ratings that we got from the wine experts or body temperature that we got from using the infrared meter, the wand.