T tests

Hey guys!
Im sooo so sorry that I didn't get to you sooner on this. My internet wasn't working properly and I was just able to check my email now.... I realize that most of you will be in bed right now, so I don't know if this will be of any use to any of you, but here it is anyway

The Ttest is in your SB1 books, and it has a procedure that will make it easy for you to follow. I used Excel because it calculated the Standard devation and means so I didn't ahve to do that by hand.

Simply enter your data into columns and use the "fx" button at the top (look in the statistical tools).

As for organizing it, you are allowed to organize it in any way that you choose. I know there was only 2 guys for the data, so if you want to separate them and see if there is a difference, you can.

There were other factors, such as Athletic abilities that you could separate the data into

Just remember there are 3 Ttests for each group
between 0 and 1 cups of coffee
between 1 and 3
and between 0 and 3

Make sure you have a null Hypothesis (There is no difference, or no effect on heart rate) and an alternative hypothesis (there is a difference or effect on heart rate)

The Ttest is a statistical tool that tells you if there is a difference in the mean of your 2 groups of data, and if there's a difference, if that difference is due to chance or due to another factor (in this case, caffiene).

Degrees of freedom.
Here's an example for you....
If I told you that there are 3 numbers, and if you add 3 numbers together, you get a sum of 10.
How many of those numbers can you pick at random?
You could randomly choose the first 2 numbers (let's say 2 and 5) that makes 7. So, can you randomly choose your third number?

No, because your third number is dictated to you, becuse you know they have to add to the number 10. Your number HAS to be 3.

Soooo, that means that you have 2 choices, or two degrees of freedom. If you have one set of data, then you take the total number of groups and subtract one.
Since our data will have 2 different sets of data to compare, I think that you have to subtract 2 from your total number to get the degrees of freedom.
(it's basically the same...you have about 8 groups for each set of cups of coffee. That's 8+8=16 groups of numbers for each comparison and then subtract 2=14 therefore there are 14 degrees of freedom).


Im not sure if that answers your question
I'll check my email first thing in the morning to see if anyone got this.

p.s. Kyle, I don't have anything posted for your ALD project, could you try doing that again?

So much Love

you guys are amazing
thank you so so much!!

I absolutely love the watch, and it means so much to me that you'd take the time to organize this. It's so funny, my parents were just commenting on how I needed a new watch, but I couldn't afford to get one right now.

You're all my angels :)

I hope I have kids like you guys in the future.
I love you all!!

P.s. Your ALD projects BLEW me away!! I love the creativity and the brilliance. I know you're gonna go far in life, and I hope I'll be able to see it happen.

Keep on shinin!!
~Miss Tenn-ilicious aka Miss Eleven minus One