What is the difference between congruence and similarity.
Two shapes are similar if they have same proportion. They may have different position and orientation. Two shapes are congruent if they have same shape and size.
How to interpret the slope and intercept in a linear function?
The slope is the unit increase in Y variable if the X variable increase by 1 unit. The intercept is the predicted value of Y variable if the value of X variable is 0.
Which one is a better measure for the central tendency if a data set has a wide dispersion? Mean or median ?
Median is a better measure for center if the data has large spread because mean will be greatly affected by the outlier(a few extremely high or low value) in the data set with large spread, but median will not be affected by the outliers. So compare to mean, median is a better measure for center for data with great dispersion.