# median test

1. ### one sample median test for a Likert item?

Today I was trying to figure out which test would be appropriate if you have an ordinal variable and want to test if the median could be equal to a given value. The ordinal variable is on a discrete scale ranging from 1 to 5. For example 20 students are asked to if they 1=fully disagree...
2. ### Skewed data - what test should I use

Research question: Does wearing a helmet affect head repositioning error in a group of normal participants compared to not wearing a helmet? 3 trials were conducted for each variable (helmet on and helmet off) for each participant. The average of the 3 trials was calculated and converted from...
3. ### [non normal Multiple sample comparison] analysis and error bars for medians

Dear all, Background: Treatment applied to 10 groups of different sizes. Each group treated with a different concentration. Groups 9 and 10 are control/sham and represent the negative outcome. Samples in each group are independent. Group numbers vary from 12 to 4 (I cannot increase the...
4. ### What method to determine correlation between Project input and output characteristics

I have designed a survey which had project managers answer a series of questions that had them rate how prevelent specific project inputs were in their projects. For example "Was a project plan used?". The prevelence of each input was indicated on a scale from 1(input was not used) to 7 (input...