Directions: Do not write on this exam.
You may use formula cards, a calculator, and
probability tables.
The time limit for this exam is 1.5 hours.
Final Exam Version A
1.
Randomly selected statistics students participated in an experiment to test
their ability to determine when a single minute had past without using a
watch.
Test the professor’s claim that students on average will report a time
that is less than 60 seconds.
A sample of 40 students had a sample mean of
58.3 seconds.
Assume the population standard deviation is known to be 9.5
seconds, and test the professor’s claim using a 5% significance level.
2.
Find a 95% confidence interval for the true average number of seconds
perceived as a minute by statistics students.
Use the information from the
above problem.
3.
Body temperatures for humans are normally distributed.
Twentyfive
randomly selected people had a mean body temperature of 98.2 with a
standard deviation of 0.62.
Does this data contradict the status quo belief
that the average human body temperature is 98.6?
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 Spring '08
 McGuckian
 Statistics, Normal Distribution, Probability, Standard Deviation, Variance

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