Best guide so far, i gave up trying to do this because i couldn't get my list to show up after entering data. Took me awhile to realize i've been typing "f1" not "L1". This guide helped me quite a bit.
The standard deviation is a number that describes how spread out the data values of a distribution are from the center of the distribution (the mean). If a student has test scores 75, 77, 79, and 76, the stnd dev will be smaller than another student with test scores 60, 70, 80, 90. Large stnd dev = more variability; small stnd dev = more consistency. The first student performs more consistently than the second student. The second student has greater variation than the first student.
What program is it that you're using that has the TI-84 interface? Is it something that comes with the TI-84? (I unfortunately have been using a Casio fx-9750GA PLUS).
Updated Video! - Here is a new video that demonstrates finding the range, variance, and standard deviation on newer models of the TI 84. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HkJuQmkl43c.html
My calculator is giving me incorrect numbers when I do exactly what you do. Why is it not giving me the same numbers as you? Is there something that I need to change in the setting of my calculator?
I am following the steps you have advised and I cannot get my TI-84 to calculate. It ask for Freq List and results in INVALID DIM & sorting the list is resulting with same error? Help!
if the question asks for s, it's sample. this would usually be the case so probably that. for the sigma, it will literally ask you to find its population
Order doesn't matter when using 1-Var-Stats to get the standard deviation (and variance). For finding the range, having the list sorted makes it simple to find the smallest data value (at the beginning of a sorted list), and the largest data value (at the end of a sorted list). To sort a list in ascending order: STAT->2:SortA(L1), or whatever list your data is in.
I don't understand how you entered just one set of numbers, but got a population variance and a sample variance, and they were different numbers. Where did the sample numbers come from? Or where did the population numbers come from?
So, the distribution is kinda like an average(mean)? What would be the purpose of finding the stnd dev of the two students? Basically, why would stnd dev be needed? Sorry for all the questions XD
i only entered 10 numbers for me and my n value is different and all my tables are blank except for the L1 which i filled with 10 numbers. why is that??? It throws all my values off.
The range is one of the three measures of variability in the study of statistics. I provided it in this example for completeness. However, it is also the easiest method of variability to compute in your head, so you really don't need a calculator.
HEY Every one !! i just met a little problem and would love your help. i cannot write anything on my screen while the details of ''1-VARS STATS'' is opened. like when she types the value of sample standard deviation. I am directed to a new blank screen as i enter any number. Can anybody PLEASE help me out? i'd really appreciate it
Hi my List is not blank like yours is. I type in your values but then I also have 0's beneath these values. then I keep getting slightly different results on my 1 variable statistics like variance-7.031180555 or sx=7.516648189
You may be using a calculator that has a more recent operating system. In that case, make sure the list your data is in is specified next to "List." Leave "FreqList" empty. Then highlight "Calculate" and press enter. TI 84 calculators are now being sold with OS 2.55, so the 1VarStats function looks a little different. However, it will still provide the same information.
The software is TI Smartview and can be purchased at the Texas Instruments web site: education.ti.com/en/us/products/computer_software/ti-smartview-software The calculator is the TI 84, and can be purchased anywhere, for example Amazon. The version shown in the video is the TI 84 Plus Silver Edition I don't know much about Casio calculators. I suppose you can search for Casio calculators for statistics and see what you find.
I'm not sure what ex2 and ex refer to in your question. However, if you are using the TI 84, the process is easier than presented in this video. You only need to specify the list where your data is stored, then press Calculate (you can leave freqlist blank if all the data is in the list).
On my TI-84 plus when using 1-Var Stats, you have to give in a list to calculate everything from (L1) and a frequency list (L2). The n-th number from the second list shows how many times the n-th number in the first list occurs in the sample. So if you give in two times the list that is shown in the video, you actually calculate for a list with 1 1, 3 3's, 5 5's... and your n then equals 50. And that's when you get these wrong answers with mean 14.16 etc. To calculate the values as shown in the video, you'll have to make a second list (L2) that is as long as the first list and contains only 1's. This will be your frequency list. If you then use these two lists in 1-Var Stats, it will give you the same results as shown in the video. I know that I answer some old reactions now, but since this is the top comment and no answer was given yet, I thought some other people might have the same problem and would like to have a solution.
Freakin' awesome! I have been doing most of this on paper =(. Btw, can you explain the purpose of standard deviation and variance?? I know what the definition says and how to do it, but I still don't understand 0.o" so laymen's terms pleaaaaaaaaaaaase!! XD
I followed the steps on here and I got the correct answers, for the most part...I keep doing it on my hw. and I keep getting the wrong answers...I'm not sure what I'm doing wrong! It's so frustrating
Thanks for the help. I have my final tomorrow our professor is nice enough to let us do the problems without writing out the chart. Just wanted to make sure I still remembered which was what XD
ProfTaormina Yeah, you do explain what it is, but you don't explain how to calculate it on a TI-83/84. You just point out that your numbers are already in order. You should have put them in out of order so that you could demonstrate how to order them and then calculate the range. That would've been much more helpful. I'm not here to learn statistics (that's what I pay a school for), I'm here to learn how to calculate statistics in my TI-83.
Jason Romine Find the range by subtracting the smallest value from the largest value. To subtract two numbers on the TI 84, or any calculator for that matter, enter the larger number, then the minus key, then the smaller number, then press enter.
