# variation

1. ### How to test for differences in mean values within a population

Hello, I am stuck on what seems to be a very simple question. I recorded the duration of 20 bird songs and I want to know whether the average duration is significantly shorter or longer for bird(s). Is there any way to test for normality? BIRD_ID DURATION A01 0.03 A02...
2. ### Total and quadratic variation of a function

Let f(x)= x2−3, for x<3, x2+3, for x≥3 I need to determine the total variation and the quadratic variation of f(x) on the interval [−4, 4]. For the total variation, I guess I can use my raw way to do it. It means see that f(−4)=13, f(0)=−3, f(2.999999)=5.99999, f(3)=12, f(4)=19. So...
3. ### Measuring variation with percent data

I'm working on a project where I have about 300 geographic units and each unit has 11-5000 people. There are five guidelines and each person can be compliant or non-compliant for each guideline. I have calculated a percent compliance for each guideline for each geographic unit. For example...
4. ### How to minimize variability in order to design a valid pricing experiment?

Good morning, I want to run a pricing experiment to see the change in the number of purchases (i.e.demand) in response to a 10% increase in price in a specific market for my product. I selected 2 markets with very similar characteristics, where one will get a treatment effect and the other...
5. ### Measure Variability of data points

I'm struggling to find the appropriate solution to a project that I'm working on. I am trying measure the variability of lead time on products that we purchase I can't figure out what an appropriate calculation would be. Below are some of the details. - I'm trying to compare vendors. Some...
6. ### Dealing with variation in subjective qualitative data

I am helping conduct a review of scholarship applications. There were approximately 275 applicants that were reviewed by various individuals. There seems to be a lot of variation in scoring among the reviewers. Issue being not everyone reviewed each individual, so those who have high...
7. ### Help with total, explained, unexplained variation and other stat stuff.

I'm not sure what the total variation, explained variation and the unexplained variation mean. Given a group of data (x,y) how would I calculate? Also, what are the coefficient of determination and the standard error of the estimate? How are they calculated? Please explain. This part is...