Measures of central tendancy and spread worksheet SD week 3 0.0 / 5 ? Business ManagementFundamentals of business management UniversityAll boards Created by: jf00632Created on: 18-01-19 12:10 first step for calculating the variance and SD 1. Add up all your data and / by how much data there is (60/5=12)- this is your MEAN 1 of 12 Second step for calculating the varaiance and SD - each bit of data from the mean (6-12=-6) 2 of 12 Third step for calculating variance and SD Square (2) each of those answers (-62=36) 3 of 12 Fourth step Add all of those answers up (120) and divide by how much data you have (120/5)= 24- this is the VARIANCE 4 of 12 Fifth step then square root the variance- 24= 49- This is your SD 5 of 12 You have a set of data which represents weight in KG what units would you use for the SD? The units for the SD would be KG. The SD always has the same units as the original data. 6 of 12 Why is the mean and SD used more often than the median and quartiles when summarising data? The mean and SD use all of the data. 7 of 12 What does it mean if data has a high SD? The bigger the SD The more spread out the data is around the mean. It mans that there is mroe variability. 8 of 12 How do you find the group containing the median? Find the frequency- then plus 1/ 2= 20.5 find the column with that figure- thats the median 9 of 12 Work out an estimate for the men time taken by students to get to lectures LOOK AT NOTES 10 of 12 Draw a c.f charts of the number of nights stayed LOK AT NOTES 11 of 12 How do you find the mean number of nights/data from a table? 1. find the midpoint 2. mid point x frequen cy 3. divide that by the TOTAL of the original frequency 12 of 12
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