# Thread: What is the T Value for df=45?

1. ## What is the Upper & Lower Limit for this?

So I got all the answers filled in except this last one, "upper and lower limit".

Here is all my data on the left of the image, please see screenshot: http://s29.postimg.org/m0fwf679h/Variables.jpg

Mean and standard dev are there in the screenshot. can anyone calculate this for me?

Thanks

2. ## Re: What is the T Value for df=45?

It is not straightforward to calculate this, you will need to look up some tables or find a calculator specifically designed for the t distribution. It asks you to use the t table in your textboo, often at high degrees of freedom the tables only give results for df=40, df=45, df=5, you will have to interpolate for df=44 if that is the case.

3. ## Re: What is the T Value for df=45?

Okay, I managed to get most of it, but can you tell me this, which is the upper and which is the lower limit number? I have 1.2119 and 1.7081, but I dont know which is which.

"The formula is mean + SE*t and mean - SE*t. You need the t value for a area of .025 with 45 degrees of freedom. T value = 2.014103359
So 1.46+2.014103359*.12318841 and 1.46-2.014103359*.12318841
limits are 1.2119 and 1.7081"

Originally Posted by Shakarri
It is not straightforward to calculate this, you will need to look up some tables or find a calculator specifically designed for the t distribution. It asks you to use the t table in your textboo, often at high degrees of freedom the tables only give results for df=40, df=45, df=5, you will have to interpolate for df=44 if that is the case.