yes, click STAT, then EDIT.. enter the observations 145 up until 182.5 on L1, enter the frequencies on L2. then quit. then click STAT again, then go right to CALC, choose 1-Var Stats. then click 2nd and 1.. the top number is the mean and the one with sigma and x is standard deviation.
@allstarjai1010 B and small b still the same sound. In the Greek alphabet Capital sigma represents the sum and small sigma standard deviation. Hope that is clear.
Your video uploads are helping a lot if students!! You are doing a great job and are also sharing your intellectual knowledge ... if i were a millionaire i would make a donation to your project and i will after i finish my medicalcourses become a successful doctor i will recommned your website as long as you intend to keep it free for other students! Thank You!!
BTW going from your list of videos on your website, I cant seem to find it there. Unless it had come up on the list on the right, I wouldve not known about it. Just asking where it is so I wont miss any important videos in the future. Thanks.
omg!! thank u soooooo much my S1 exam just in 5 days. I really wished that I know ur site earlier so I can secure my As A grade :"""( but again thaaaaaaaaaaaaaank u
coolmindoo7 What is with the ellipsis followed by the exclamation marks?! If you're covering Standard Deviation, you're at least college age, and that's the grammar of a primary school student. ExamSolutions Thanks for the helpful tutorial; It was really useful, as our AS Maths teacher thinks he's more a University Lecturer, and doesn't even explain that well.
Using x bar and sigma in the same question! Am i right on the following? x bar stands for the mean of a sample whereas sigma stands for the standard deviation of a population. If we use xbar, we should not use the sigma notation but rather sdx. If we use mu for the mean, then we can use sigma for the sd, making sure that the set of data given is that of a population. Your comment plz!
Hi, great job on the tutorials it's great!! But I have a question... In the MEI Exam.... Standard Deviation (sx or sd) is sqrt((Sigma(f(x)^2 - n(mean)^2) / (n - 1)) Root Mean Square Deviation (Sigma or Sigma x) is that above but without the (- 1) on the denominator. Just wondering which one is right because from the video you did the rmsd...
GSR RoadRunner There is always controversy over this between boards. Some boards accept both as being correct. There is also controversy over notation used. I was always taught that you use n-1 when estimating a population variance given sample data. n when calculating a population variance given the population data In the example video, the data is the population, not a sample taken from a population.
Ok, thanks for the reply =] Just did the S1 Exam today, used all your video's for revision in one day. I have to give you a big thanks! I hadn't touch S1 in nearly a year and without those videos it wouldn't have gone so smoothly. Just have to wait now for a couple of Months for my result. Thanks again, M
Kyron depending on the exam you need to show your workings to get full marks, on top of that if you do your workings and get it wrong you'd get most of the marks 8/10 for example, if you put it in your calculator, do something wrong by accident and get the wrong answer you'll get 0/10
In a real exam, you have a calculator. Is there a way to do this on a TI-83Plus quickly? We only get a max of 4 marks (which translates to 4 minutes of working this out) and time is scarce.
Sorry to say but I am correct. You clearly did not see the dot over the 3 which meant 162.833333333333... . Use this value and you will get the correct answer.
wait a sec, both standard deviation equations don't equal to each other? one is for sample standard deviation and one is for population standard deviation?
