1. A

    Can I compare results from 5 point likert scale to results from 4 point likert scale?

    Can I compare mean (descriptive analysis) from 5 point likert scale to a mean of 4 point likert scale? Results from 5 point likert scale: M: 3.34 (SD: .80) Results from 4 point likert scale: M: 2.18 (SD .44) I want to compare these results, is that possible? Thanks in advance,
  2. H

    Statistical power of two dataset

    Hi All, I would like to inquire how to decide whether Dataset A or Dataset B would be reliable based on their coefficient of variation, number of data points and mean value. What kind of factors could be considered? I am not searching for the direct answer but rather to jump into the...
  3. A

    How can I find an interval estimate for the mean of a Weibull distribution?

    I have a sample of n = 75 taken from a Weibull distribution and have computed mle estimates for the scale a and shape b parameter. The mean of a Weibull distribution (2 parameter) is given as u = a^(-1/b)*gamma(1+ 1/b) In which case I can find an estimate for u by simply plugging in the mle...
  4. M

    Hypothetical Statistics Question Regarding Class Curve, Standard Dev, and Mean

    Theoretical question: So say there is a course where if you score two standard deviations below the mean, you will fail the course. The class average will be roughly a 75%, not sure what to set as the baseline for standard dev, and say 150 people are in the class. One person is added to the...
  5. L

    Merits and Demerits

    What is the merits and demerits of mean median and mode? I have already found a link discussing the topic I want to that is helpful or not.
  6. A

    plot mean value according to confidence interval

    Hi all, i have a very simple question, because i am not good at statistics but i need that :) I have two signals, one is lets say 'x' another is 'time', so its a time serie. I need to find the upper and lower values of my signals according to confidence interval and then show them on a graph...
  7. A

    How to find the probability of a sampling error made in estimating the population mean?

    Alright, I have been working on my statistics assignment since Monday and I only have two questions left, dealing with the probability of a sampling error. Unfortunately, I cannot find anything in my notes and only a brief example in my textbook that does not explain the concepts behind the...
  8. Y

    Average of standard deviation as repeat accuracy for five measurement series

    Hi there, I hope you can help me with the following question. I measured the power input and output of a storage and retrieval vehicle with 1,000 single measuring points. I repeated the measurement five times with the same measure method and same time steps. The result is five measurement series...
  9. Cameron

    There was a significant difference between mean scores, so what’s next?

    What’s the mathematical meaning of a significant difference between mean scores? What should we expect? What we are allowed to say about our two groups? For example, if I have done a survey and I have a significant difference between males and females in intelligence. After this survey what I am...