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STAT 400-EXAM 3 August 22, 1997
Work each numbered problem on a separate answer sheet. (You may use both front and back of each sheet.) Show all work on
problems 2-4: partial credit may be give:n for wrong answers if the method shown is essentially correct. Correct answers without
adequate supporting work may receive no c:redit.
1. For each of the following problems (a-e) choose from the list on the right (a) the type of
problem (choices A-E), (b) the random variable or sta.tistic used (choices F-R) and (c) the
distribution involved together with the degrees of freedom where appropriate (choices S-V).
Do not compute numerical answers. Your answers should consist of three letters and 1he
degrees of freedom for all but the normal distribution.
(9) a. A random sample of 100 students from a college showed an average IQ score of 112
with a standard deviation of 10. Establish a 95% confidence interval estimate of the
mean IQ score of all students attending the college.
(9) b. A circuit fuse ...

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