Quiz 6
Statistics 21
Spring 2010
Ibser
For questions 2 and 3 of this quiz, do the hypothesis test that you think is the most
appropriate.
Include null and alternative hypotheses as detailed in lecture, a test
statistic (z or t), pvalue, and conclusion.
1.
Vincent is interested in the average math SAT score of all 3,500 seniors at Sunshine
High School. The math SAT score ranges from 200 to 800 points. He surveys a
simple random sample of 400 students, and finds that their average score is 710
points, with a standard deviation of 60 points.
a.
The average math SAT score of all 3,500 seniors at Sunshine High School is
estimated as ________, and this estimate is likely to be off by _______ or so.
b.
Vincent correctly constructs an 84% confidence interval for the average math
SAT score of all 3,500 students at SHS. What is the interval? (This interval
will be referred to as Vincent’s interval throughout this problem.)
c.
The 84% confidence interval is (about right, not accurate) because
_____________________________________________________________________
(follows, doesn’t follow) the normal curve.
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 Fall '08
 anderes
 Statistics, Normal Distribution, Null hypothesis, Statistical hypothesis testing, Math SAT score

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