Stats Unit 4 Flash Cards 2.0 / 5 based on 1 rating ? StatisticsGCSEEdexcel Created by: Elizabeth RillieCreated on: 21-06-13 12:22 Average Is a single value used to describe a data set 1 of 31 Mode Most common value 2 of 31 Median Is the middle value in an ordered list 3 of 31 Mean Add all of the values together and divide by the total number of values 4 of 31 Modal Frequency Is the class with the highest frequency 5 of 31 Median Frequency Is the middle value in the frequency column 6 of 31 Mean Frequency (Sum of frequency x value) divided by (Sum of the total no. of values) 7 of 31 Modal Class The class with the highest frequency 8 of 31 Estimated Mean for Grouped Frequency (Sum of frequency x mid point) divided by (Sum of total no. of values) 9 of 31 Estimated Median for Grouped Frequency (n + 1) divided by 2 10 of 31 Tranforming Data If the numbers are too big, then they can be multiplied/divided/added/subtracted to get easier numbers to handle 11 of 31 Weighted Mean (Sum of weighting x value) divided by (Sum of weighting) 12 of 31 Range Highest value minus Smallest value 13 of 31 Lower Quartile for Discrete Data - Q1 Is the value that is equal to 25% or (n + 1)divided by 4 14 of 31 Middle Quartile for Disctete Data - Q2 Is the value that is equal to the median/50% or (n + 1)divided by 2 15 of 31 Upper Quartile for Discrete Data - Q3 Is the value that is equal to 75% or 3(n + 1)divided by 4 16 of 31 Lower Quartile for Continuous Data - Q1 n divided by 4 17 of 31 Middle Quartile for Continuous Data - Q2 n divided by 2 18 of 31 Upper Quartile for Continuous Data - Q3 3n divided by 4 19 of 31 Interquartile Range Q3 - Q1 20 of 31 Percentile If the data is divided into 100 parts, then each part is a percentile 21 of 31 Decile If the data is divided into 10 parts, then each part is a decile 22 of 31 Box Plot Shows the distribution of a data set. It shows the min/max values, the median and the quartiles 23 of 31 Outliers Are extreme values that is more than 1.5 times below/above Q1/Q3 24 of 31 Varience Is the measure of dispersion or spread 25 of 31 Standard Deviation Is the square root of the varience 26 of 31 Data Comparison Comparing two sets of data by using the central tendancy or by using the spread 27 of 31 Standardised Scores Used to compare individual results 28 of 31 Index Numbers To see how things vary over time 29 of 31 Chain Base Index Number Is used to show how the price each year compares with the previous price 30 of 31 Weighted Index Numbers Is a way of comparing weighted means. 31 of 31
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