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ids 270 final exam solved 100% correct.IDS 270 Final Exam
UIN: Please write your name on the top of the back of the very last page of what you turn in.
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There are multiple version of the exam being used during this examination period. If your exam shows work that is based on information from a different version of the exam then you will receive a zero for the entire exam. Initial to acknowledge: 1.Define each of the following completely (including reference to the sample vs. the
population where appropriate). 5 Points
mu-- population mean [1]
s -- sample standard deviation [1]
sigma-- population standard deviation [1]
x-bar-- sample mean/average [1]
sampling distribution-- a set of sample means from the same population [1]
[Note: Book has longer answer along the lines of ‘set of all possible statistics from repeated samples blah blah blah’ That answer is also acceptable. Ththtpiss: s/t/uwdwywso.cuorucerswehaesrod.ocwomnl/2.(10 pts.) A random sample of 36 postal workers is taken and their number of years on the job is recorded. The calculated average number of years is 8 and the standard deviation calculated from the sample is 4 (s=4). Find a 90% confidence interval for the population mean number of years on the job for postal workers. Show all work.
d.f.=n-1=36-1=35,
No 35 on the table, so must use 30 for degrees of freedom C.L. = 90% ==> t* = 1.697[3']
m.e. = t* s/sqrt(n) = 1.697*4/6 = 1.131 [4']
[3']
8 +/- 1.131 = (6.869, 9.131)
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