These are followed by a few examples, aimed at illustrating the importance of choosing the statistical technique or graphical display which is most appropriate for the situation. When a set of data is used to estimate a population characteristic, it is essential to quantify the doubt associated with that estimate.
Some standard techniques are available as part of the school curriculum.
Once again, mastery of these techniques is not essential to win an SSC prize. You have learned various methods to summarize the data. Not all data follows this nice symmetric pattern. Although it is difficult to predict individual observations, it is usually easier to say what happens on average. However, when predicting the height of individuals, the length of the interval does not decrease with larger n .