Confidence                                                           Z-Score
       Level            Alpha         Area to...
on the formulas they give you for the Z score on Part 3 of the Lab.

                                                     ...
GREEN CELLS.

G LIKE THE "LOWEST
OU MIGHT CONSIDER
R 99% LOWER LIMIT.

dence lower limit you would
e time the actual would...
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Confidence Intervals Using Z Scores

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Note this is for Confidence Intervals based on Z Scores only! You input your specifics into the green cells and don't touch anything else. You need to download before using.

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  • Prof. Heard, I am currently taking Statistics through Devry and have found your Connect Live sessions very useful. I am hoping you can help me with z-scores. I am totally confused with these. I can’t figure out how to use Excell to get the answers. I listened to your session this week (week 5) with Normal Distribution, but am lost with z-scores!
    my email is: nitro_us_007@yahoo.com
    Thanks!
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  • Brent. how do I download and open this file and the other one like it? It just shows up as gibberish.

    Thank you,
    Deb
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  • Brent. how do we download this file as well as the other one like this as all it gives is a bunch of gibberish? Thank you for all your help.
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  • Brent, I am having trouble downloading this file. It seems to only be downloading a zip file with a bunch of xml files. I don't find an excel file at all. Can you please help? My email is pbrandal@my.devry.edu

    Thanks for all your help with Statistics. It is invaluable!
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  • Brent you are the man.
    Last week I made an A on the week quiz.
    I could not have done it without you.
    Thank you so very much.
    Lynn Brown
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Confidence Intervals Using Z Scores

  1. 1. Confidence Z-Score Level Alpha Area to Left Z-Score (Rounded) 95% 0.050 0.975 1.959963985 1.96 93% 0.070 0.965 1.811910673 1.812 98% 0.020 0.99 2.326347874 2.326 99% 0.010 0.995 2.575829304 2.576 To find the Confidence Interval (like for Number 4 on Part 4 of the Lab), I built a little template based on the formulas they give Enter Your Mean, Standard Deviation, number of data points, and Con Mean Std Dev n (# of data pts) Desired Conf. 78.4 6.205 40 92% Results (the true mean amount would be between these two values) Calculation Cells, Do Not Change These Values 8% 0.96 1.750686071 1.751 1.717900224 Lower Upper 76.68 80.12 So you would say that with 92% confidence, you can say the true mean is between 76.68 and 80.12 Note this if for Confidence Intervals based on Z Scores only! You input your specifics into the green cells and don't touch anyth
  2. 2. on the formulas they give you for the Z score on Part 3 of the Lab. ONLY ENTER IN THE GREEN CELLS. points, and Confidence Level TO FIND SOMETHING LIKE THE "LOWEST POSSIBLE VALUE" YOU MIGHT CONSIDER FINDING THE 98% OR 99% LOWER LIMIT. WITH the 98% confidence lower limit you would know that 99% of the time the actual would be higher. WITH the 99% confidence lower limit you would know that 99.5% of the time the actual would be higher. cells and don't touch anything else.
  3. 3. GREEN CELLS. G LIKE THE "LOWEST OU MIGHT CONSIDER R 99% LOWER LIMIT. dence lower limit you would e time the actual would be dence lower limit you would he time the actual would be

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