"Statistical inference" refers to the process of:
Answer(s): A
Note that statistical inference is always carried out with sample data, since you never have access to the entire population (if you did, you would no longer call it "inference"!).
A study of the scores on an in-plant course in management principles and the years of service of the employees enrolled in the course resulted in these statistics:Mean test score was 200 with a standard deviation of 40Mean number of years of service was 20 years with a standard deviation of 2 yearsIn comparing the relative dispersion of the two distributions, what are the coefficients of variation (CV)?
Answer(s): D
The respective CVs are found from (s*100)/mean. Test: 40*100/200 = 20% and Service: 2*100/20 = 10%.
How long will it take money to double at 9.5% per year, compounded annually?
To solve this question, choose a future value that is twice the size of the present value. The actual number will not matter. On the BAII Plus, press 9.5 I/Y, 1000 PV, 0 PMT, 2000 +/- FV, CPT N. On the HP12C, press 9.5 i, 1000 PV, 0 PMT, 2000 CHS FV, n. Note that the HP12C will show 8 for the answer. The answer will be the same as long as the FV is twice as large as the PV.
Which measures of central tendency are not affected by extremely low or extremely high values?
Both are concepts which are based on the position of the observations when ordered (median) and the number of most frequent occurrences (mode). They are measures which are not affected by extreme values.
In a distribution that is right skewed:
large positive deviations dominate large negative deviations.
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