Statistics - mean, median and mode 3.0 / 5 based on 1 rating ? StatisticsGCSEEdexcel Created by: NikkiCreated on: 28-03-13 23:25 Average used to combine different sets of data when one is more important than the other Weighted mean 1 of 32 The average of a set of data The mean 2 of 32 The middle value of a set of data Median 3 of 32 The most common value that occurs in a set of data Mode 4 of 32 The spread of the data Range 5 of 32 The difference between the upper quartile and lower quartile Interquartile range 6 of 32 How much the data varies from the mean Variance (variance = standard deviation squared) 7 of 32 Measure of spread (square root of variance) Standard deviation (variance = standard deviation squared) 8 of 32 Distribution that shows the lowest value, Q1, median, Q3 and highest value Box plot 9 of 32 The name of values which are <Q1 - (1.5 * IQR) or values >Q3 + (1.5 * IQR) Outliers 10 of 32 An outlier is... A value: lower than (1.5 * IQR) below the mean OR (1.5 * IQR) above the mean 11 of 32 The formula for working out a standardised score is... (value - mean) / (standard deviation) 12 of 32 A standardised score above zero means... the value is better than average 13 of 32 A standardised score below zero means... the value is lower than average 14 of 32 When comparing box plots, you should compare... Range, IQR, median, skew 15 of 32 Chain base numbers are numbers that show... how values change from year to year 16 of 32 a type of average used to analyse a set of data points by creating a series of averages of different subsets of the full data set Moving average 17 of 32 Variation in the values of a variable dependent upon the time of the year Seasonal variation 18 of 32 You use moving averages to plot a... Trend line 19 of 32 The difference between a real value and the trend line value Seasonal effect 20 of 32 The maintenance of a desired level of quality in a service or product Quality assurance 21 of 32 Quality assurance - When a value is outside the action limits (3.S.D)... The process must be stopped 22 of 32 Quality assurance - When a value is outside the warning limits(2.S.D)... Another sample must be taken 23 of 32 Defne positive correlation As one variable increases, the other does too 24 of 32 Define negative correlation As one variable increases, the other decreases 25 of 32 Define no correlation The variables are not linearly related 26 of 32 When points are close to the line of best fit the correlation is... Strong 27 of 32 When the points are spread out the correlation is... Weak 28 of 32 Whe one variable causes change in the other it is called... Causality (e.g. rise in temperature causes a rise in ice cream sales) 29 of 32 The measure of how closeley related two sets of data are Spearman's Rank Correlation Coefficient 30 of 32 This is used to find a value that lies between two known values (e.g. using a line of best fit) Interpolation 31 of 32 Making predictions outside of the plotted data (e.g. extending the line of best fit) Extrapolation 32 of 32
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