carolinar7
  • carolinar7
What is the positive z-score of 3.75
Mathematics
jamiebookeater
  • jamiebookeater
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carolinar7
  • carolinar7
carolinar7
  • carolinar7
anonymous
  • anonymous
Take a look at the z-score chart.

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dan815
  • dan815
zscore is telling you how many standard deviations you are away
carolinar7
  • carolinar7
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.
carolinar7
  • carolinar7
Ya I know but It only goes up to 3.4
dan815
  • dan815
you can actually use a integral formula to find out the probability there
carolinar7
  • carolinar7
ok
carolinar7
  • carolinar7
Ok but im finding the z-score for the question above that may help
dan815
  • dan815
9/10 is same as 90/100 = 90%
carolinar7
  • carolinar7
or you can simply help me solve it
carolinar7
  • carolinar7
oh so that is the confidense interval?
dan815
  • dan815
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
carolinar7
  • carolinar7
I got (75-3.75)% and (75+3.75)% for error thing am I right
anonymous
  • anonymous
use excel function = NORMSDIST(Z-value)
carolinar7
  • carolinar7
Is 3.75 the z value though @dan815
anonymous
  • anonymous
doge
anonymous
  • anonymous
My bad m8 I dont know how to do this
carolinar7
  • carolinar7
carolinar7
  • carolinar7
carolinar7
  • carolinar7
anonymous
  • anonymous
@frankwillfindyou Hi fellow doge

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