Question
1} In a random sample of nine people, the mean driving distance to work was 25 miles standard deviation was 5 miles. use the t-distribution
1} In a random sample of nine people, the mean driving distance to
work was 25 miles standard deviation was 5 miles. use the t-distribution to find the margin
of error and construct a 98% confidence interval for the population mean. Interpret the
results.
2} Construct the indicated confidence interval for the population mean(mu)
C=90% ,=31 = 0.85, n=100
3} The undergraduate grade point averages (UGPA) of students taking
the Law School Admission Test in a recent year can be approximated by a normal
distribution,With a = 3.40 = 0.2
. (a) What is the minimum UGPA that would still place a student in the top 10% of
UGPAs?
(b) Between what two values does the middle 50% of the UGPAs lie?
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