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carolinar7

  • one year ago

What is the positive z-score of 3.75

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  1. carolinar7
    • one year ago
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    @Jaynator495

  2. carolinar7
    • one year ago
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    @mathway

  3. anonymous
    • one year ago
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    Take a look at the z-score chart.

  4. dan815
    • one year ago
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    zscore is telling you how many standard deviations you are away

  5. carolinar7
    • one year ago
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    A field test for a new exam was given to randomly selected seniors. The exams were graded, and the sample mean and sample standard deviation were calculated. Based on the results, the exam creator claims that on the same exam, nine times out of ten, seniors will have an average score within 5% of 75%. Is the confidence interval at 90%, 95%, or 99%? What is the margin of error? Calculate the confidence interval and explain what it means in terms of the situation.

  6. carolinar7
    • one year ago
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    Ya I know but It only goes up to 3.4

  7. dan815
    • one year ago
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    you can actually use a integral formula to find out the probability there

  8. carolinar7
    • one year ago
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    ok

  9. carolinar7
    • one year ago
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    Ok but im finding the z-score for the question above that may help

  10. dan815
    • one year ago
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    9/10 is same as 90/100 = 90%

  11. carolinar7
    • one year ago
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    or you can simply help me solve it

  12. carolinar7
    • one year ago
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    oh so that is the confidense interval?

  13. dan815
    • one year ago
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    yes 90% confidence interval is giving you the interval for the xmin and xmax where there is 90% of the proablity so the interval [5,75] is 90% of the population

  14. carolinar7
    • one year ago
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    I got (75-3.75)% and (75+3.75)% for error thing am I right

  15. anonymous
    • one year ago
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    use excel function = NORMSDIST(Z-value)

  16. carolinar7
    • one year ago
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    Is 3.75 the z value though @dan815

  17. anonymous
    • one year ago
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    doge

  18. anonymous
    • one year ago
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    My bad m8 I dont know how to do this

  19. carolinar7
    • one year ago
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    @SithsAndGiggles

  20. carolinar7
    • one year ago
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    @zzr0ck3r

  21. carolinar7
    • one year ago
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    @vera_ewing

  22. anonymous
    • one year ago
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    @frankwillfindyou Hi fellow doge

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