Practice+Final+A-Solutions - Practice Final A 1. What...

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Unformatted text preview: Practice Final A 1. What is the skew of the data represented by the below graph? Explain how you know. a. To the right. Positive. Median is way to left. Very close on left. 50% of scores spread out on right. 2. What is the skew of the data represented by the below graph? Explain how you 3. 4. 5. 6. 7. know. a. Negative to the left. Median  ­5 mean ­4.33 What is the scale of measurement of the variable “snowfall in the winter in Nevada” measured in centimeters). a. Ratio Which of the following errors refers to chance error in the measurement of an individual: standard error or probably error? No need to explain. a. Probably error You have a set of numbers and want to know the standard deviation of these numbers. Please calculate it. The numbers are: 1, 1, 5, 7, 8, 8. a. 3 If the data is strictly ordinal in nature, why is it inappropriate to measure its spread with the standard deviation? a. Because calculating the SD requires arithmetic which ordinal data doesn’t support. For questions 8 ­10 8. What is the dependent variable and what is its scale of measurement? a. Number of appropriate verbal responses. Ratio 9. Describe what one of this experiments parameters would be. a. The average number of appropriate responses (for a certain category) in the population. 10. What is an example of logical inference. a. The drug will also decrease hallucinations, delusions, etc. 11. If you divided the sum of squares by n, what would you get? a. variance 12. The whisker in a box plot has to be less than what? a. 1.5x the IQR 13. Mu is equal to what in Poisson distribution? a. variance 14 ­18. Calculate skew, kurtosis, chi squared, variance, and standard deviation for the following numbers. 1,2,3,5,5. SD ­ 1.788 VAR ­ 1.6 Skew=  ­.02519 Kurtosis= .9098 Chi ­squared= unable to calculate. (trick question!!!) ...
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This note was uploaded on 12/12/2010 for the course ECON ECON 15A taught by Professor Rajendram.patel during the Fall '10 term at UC Irvine.

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