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