Descriptive statistics 0.0 / 5 ? Sports Scienceresearch and statisticsUniversityNone Created by: Matt CatterallCreated on: 15-11-17 17:17 what is a measured variable assigning numbers to objects, events or concepts according to a set of rules, allowing them to be categorised 1 of 28 list the levels of measurement nominal, ordinal, interval, ratio 2 of 28 nominal scale identity or category, must be mutually exclusive, good for quantifying qualitative data 3 of 28 ordinal scale a measure of order e.g. small/medium/large 4 of 28 interval scale a measure of order and quantity, difference between values can be calculated but can't establish X-fold increases e.g. shoe size/ year of birth 5 of 28 ratio scale interval scale WITH AN ABSOLUTE ZERO, and therefore X-fold increases. e.g. time to run a race 6 of 28 what is the symbol for luminance cd (candela) 7 of 28 symbol for current A (ampere) 8 of 28 what are the benefits of using the mode as an ICT quick to find, unaffected by extreme scores, can be used with any LoM 9 of 28 what are the disadvantages of using the mode terminal statistic (can't be used further), a sub group (e.g. very poor people) can make it unrepresentative 10 of 28 benefits of using the median as an ICT unaffected by extreme scores, can be used at all levels above nominal 11 of 28 disadvantages of using the median ignores value/magnitude, only considers order 12 of 28 benefits of using the mean as an ICT very sensitive measure, accounts for all the data, can be combined with other data to find an overall mean 13 of 28 disadvantages of using the mean very sensitive, can only be used with interval/ratio data, can only be used when scores are symmetrical about the mean (bell curve) 14 of 28 who first described and who applied the normal distribution curve De Moivre, Frederick Gauss 15 of 28 what are the 5 characteristics of a Normal Distribution curve naturally occurring, theoretically asymptotic, symmetrical about ICT, point of inflection is the first SD, the Z score is equal to the SD 16 of 28 what is the name given to a normal ND curve mesokurtic 17 of 28 to a pointy curve leptokurtic 18 of 28 to a flat curve platykurtic 19 of 28 generally, for a negatively skewed curve, from R to L what order will the ICTs be mean, median, mode at the highest point 20 of 28 give 4 reasons why distribution is important. 1) determines which ICT to use 21 of 28 2) determines which measure of variability to use 22 of 28 3) provides a Z score for standardised comparisons 23 of 28 4) determines parametric (powerful, uses normal ND curves) or non-parametric stats analysis 24 of 28 give the 5 measures of variability SD, SEM, range, IQR and nCI 25 of 28 where should you use SD and where should you use SEM. what if results are non-normal SD in the method and SEM in the results. use IQR and median if results are non normal 26 of 28 what is SEM a measure of sampling error - how accurate our mean is 27 of 28 what is nCI normalised Confidence Interval represents the difference between means 28 of 28
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