anonymous
  • anonymous
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 6% of 80%. 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.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@Loser66
anonymous
  • anonymous
@Hero
Loser66
  • Loser66
I don't know.

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anonymous
  • anonymous
Can you mention someone for me please
Loser66
  • Loser66
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
the key phrase here is `nine times out of ten` which points us to a 90% confidence interval
jim_thompson5910
  • jim_thompson5910
90% of the confidence intervals generated will have the population parameter we're interested in
anonymous
  • anonymous
ok
anonymous
  • anonymous
So what would be the margin error
jim_thompson5910
  • jim_thompson5910
`seniors will have an average score within 6% of 80%` the target is 80%. Basically this is the stated population parameter the 6% is the error from the target. You can go 6% too high, or 6% too low
jim_thompson5910
  • jim_thompson5910
|dw:1440113642475:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1440113668269:dw|
anonymous
  • anonymous
So basically I was already given the answers within the question.
jim_thompson5910
  • jim_thompson5910
pretty much
jim_thompson5910
  • jim_thompson5910
they just wanted you to interpret it a different way
anonymous
  • anonymous
ok thank you, so that is it?
jim_thompson5910
  • jim_thompson5910
yeah there's one more part, but I'm sure you see what the confidence interval is
anonymous
  • anonymous
so what does the confidence interval mean? Sorry if I am bothering you
jim_thompson5910
  • jim_thompson5910
it means that we're 90% confident that the true mean is between 74% and 86% the true mean is usually at the center of the confidence interval
anonymous
  • anonymous
Ok Thank you
jim_thompson5910
  • jim_thompson5910
no problem

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