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Confidence Interval On Ordinal Data

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  • #43366

    Jessica Yoden
    Participant

    I conducted a survey and asked my customers to rate my service on a scale of 1 to 10. 1 being least satisfied to 10 being most satisfied. I have total of 3000 survey results. Now I dont want to analyze all the 3000 survey’s – i want to focus on a sample size which will give me 95% confidence. Can someone please help as to what formula to use in this ordinal level of data for confidence interval.

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    #137506

    BTDT
    Participant

    Jessica:Any sample of data will give you a 95% confidence interval, it is wider when you have less data.Since you have all your data, you do not need to sample it. Run your analysis using all of the data your have and the results will calculated your 95% CI.Cheers, BTDT

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    #137508

    Jessica Yoden
    Participant

    But the problem I am running into is, all the survey is in paper format – we dont have resources to read all 3000 of them – so I want to pick a sample of these surveys and come up with a result stating that I am 95% confident that my customer satisfaction score is say 6.

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    #137509

    Ritz
    Member

    Jessica,
    A couple of questions – namely, why did you conduct 3000 surveys if you didn’t have the resources to analyze the results?  Did you run a sample size calculator that provided you with that level of sampling?
    If you haven’t run a sample size calculation, that would be the place to start.  Use the tool bars on this site to brush up on the calculation, including gaining a better understanding of Power.  You should find the answer to your question fairly easily.  If, after you have used this site or other resources (Minitab help section is really quite helpful), and you still have questions post again and we can get into a deeper discussion.
    Good luck.
    Ritz

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    #137748

    RB
    Participant

    Also, would like to suggest, once you have picked up a sample size.. why not try MTS to analyze the results?
    Good luck.
    RB

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    #137749

    indresh
    Participant

    hi
    taking this forward i wanted to also know what kind of tools etc we can use for analysis oif such data
    i have a data of responses on 1-5 on 42 questions from 1500 people
    these questions reflect various parameters of cstomer service
    thanks
     

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    #137750

    Kumar
    Participant

    Indresh:
    We have tried MTS for such surveys..
    You do not need any special tools, besides Minitab, and ofcourse knowledge of MTS..
    Let me know if you need more information on MTS.
    Good luck,
    Ravi

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    #137751

    indresh
    Participant

    yes sure
    sample data format is as follows
    name of customer
    parameter 1                      rating on 1-5
    parameter 2
    parameter 3
    few of the top parameters are related to overall loyalty and satisfaction etc
    and subsequently there are 42 process related questions
    can we someway find the effect of rating on any process to any of the output parameter
    rgds
     

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