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Basic Question 0 of 5
A sample was taken of the salaries of 4 employees from a large company. The following are their salaries (in thousands of dollars) for this year: 33, 31, 24, 36. The variance of their salaries is ______.
User Contributed Comments 16
| User | Comment |
|---|---|
| kaliokale | This is the sample variance not the population variance |
| willeen | what number is m in the explanation above? thanks! F |
| Cooltallgal | m is 4 in this case as it stands for the 4 employee's salaries. |
| bwbarksdale | remember that the sample variance divides by "1" less than the population variance in order to achieve an "unbiased" measure of dispersion. |
| janetse | What are the steps in BAII? |
| JimM | Steps in BAII: 1) 2nd - DATA 2) enter the four data points as X values, leaving Y values alone (defaults to 1.0000) 3) 2nd - STAT 4) down arrow to read Sx (5.0990) 5) Variance is square of Sx, so hit x^2 button (26.0000) |
| albert2008 | Thanks for the calc instructions!!! |
| JanLani | Yeah, the calculator trick is greatly appreciated. |
| morek | Anyone know instructions for HP12C? Thanks. |
| czim | HP12c ; enter the data values using E+ in the stats function. Then key g s Enter to give you the standard deviation of the sample. simply square this to get sample variance. |
| tschorsch | for HP12c f Σ i.e. f SST clears stat data 33 Σ+ 31 Σ+ 24 Σ+ 36 Σ+ g s i.e g . g x² or enter x |
| DonAnd | Thanks for the steps using BA11. These are one set of formulas that I made sure that I knew well so I just use the formula but the calculator steps will definitely save me some time. |
| harpalani | Guys, can someone please explain the logic of reducing 1 from number of samples for calculating sample variance. How does the sample variance become biased when sample size is not reduced by 1? |
| ThomasDess | Steps in BAII' - cf JimM post 3) 2nd - Stat 3') 2nd - SET - press repeatedley until the CALCULATION METHOD you want is displayed; for one-variable data set 1-V; !! - for this case we would find the same results for Sx for Lin and Exp methods but not for Ln and PWR 4) down arrow to read Sx etc |
| thekobe | very important to put attention at the word "sample" |
| 2014 | Thanks Jim |
I am using your study notes and I know of at least 5 other friends of mine who used it and passed the exam last Dec. Keep up your great work!
Barnes
Learning Outcome Statements
describe the use of CDS to manage credit exposures and to express views regarding changes in shape and/or level of the credit curve;
describe the use of CDS to take advantage of valuation disparities among separate markets, such as bonds, loans, equities, and equity-linked instruments.
CFA® 2025 Level II Curriculum, Volume 4, Module 30.