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Thread: Stats Assignment

  1. #1
    phantasia's Avatar
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    Stats Assignment

    Good day everyone

    Can anyone help me with this so I can see if I can also get to the answer.
    Please tell me what I should search on google to get a tutorial to do this myself




    Thank you
    Will definitely rep

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    Lyrichord's Avatar
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    In terms of finding a guide on the internet, I found this website from a simple search: "how to compute standard deviation." A similar search in Youtube should be equally helpful. Those should walk you through it!

    "How to ___" searches are great for everything from math and stats to writing poetry and just about anything else you can think of.

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    I gave this a shot

    A.

    To calculate the mean (μ): Multiply each value by its probability and add them up.
    To calculate the standard deviation (σ): Subtract each value from the mean, square it, multiply it by its probability, add up everything, and take the square root.
    To find the range within 3 standard deviations: Multiply the standard deviation by three, then add that number to the mean for the upper bound, and subtract that number from the mean for the lower bound.


    B.
    To create a cumulative probability distribution: Make flood damage rands the X-Value, and the probability the Y-Value. Put the entire table in order by X-Value (1, 6, 8, 11, 14), then add each probability to the previous one. So 6 has a Y-Value of 0.2 because (0.1 + 0.1). Then 8 has a Y-Value of 0.3 because (0.1 + 0.1 + 0.1).


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    I have a new respect for all who answered on this page.


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    The method we had to use was a little bit different to the one @(you need an account to see links) used.
    The answers are so close
    Luckily we had a tutor session and I did end up getting 100%
    My exam is on the 7th Of June This is 1 unit of a 3 uunit course.
    Then I will be on my own some pray hard pray really hard

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    Sephora (05-31-2023)

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    Quote Originally Posted by Sephora View Post
    I gave this a shot

    A.

    To calculate the mean (μ): Multiply each value by its probability and add them up.
    To calculate the standard deviation (σ): Subtract each value from the mean, square it, multiply it by its probability, add up everything, and take the square root.
    To find the range within 3 standard deviations: Multiply the standard deviation by three, then add that number to the mean for the upper bound, and subtract that number from the mean for the lower bound.


    B.
    To create a cumulative probability distribution: Make flood damage rands the X-Value, and the probability the Y-Value. Put the entire table in order by X-Value (1, 6, 8, 11, 14), then add each probability to the previous one. So 6 has a Y-Value of 0.2 because (0.1 + 0.1). Then 8 has a Y-Value of 0.3 because (0.1 + 0.1 + 0.1).
    So I am saving this because you made it seem so easy! I haven't taken stats for like 7 years. Your work brings me back!

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    Quote Originally Posted by phantasia View Post
    The method we had to use was a little bit different to the one @(you need an account to see links) used.
    The answers are so close
    Luckily we had a tutor session and I did end up getting 100%
    My exam is on the 7th Of June This is 1 unit of a 3 uunit course.
    Then I will be on my own some pray hard pray really hard
    Oh wow! Thanks for posting the solution. I see that for getting variation, you multiplied the deviation to the frequency instead of the probability, then you divide the total by (n-1) where n is number of samples. I hadn't thought of doing it like that.
    I feel proud that I was only a rounding difference away from the real standard deviation, and the cumulative probability distribution was correct.
    Congrats on the 100% and good luck on your exam, @(you need an account to see links). I'm sure you will do great in the next two units as well! Start your assignments early and ask for help as soon as you get stuck. You could post here again if it's an emergency and I'll take another attempt at it.


    Quote Originally Posted by Rebel_Minx View Post
    So I am saving this because you made it seem so easy! I haven't taken stats for like 7 years. Your work brings me back!
    It's been 5 years for me! I had to google the formulas.


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