# Quiz : Appendixes

Descriptive statistics are used to describe what's going on in the data. Directive and insightful statistics cannot be used for decision making and to draw the conclusions. Hence, the options (b), (c), and (d) are incorrect. Inferential statistics are used to infer from the sample data to make judgements of the probability, make decisions, and draw conclusions. These statistics can be used to make inferences from the given data to more general conditions. Hence, the correct option is (a) inferential.

Mean, median, and mode are three kinds of averages used in maths and statistics. The mean is the average, where all the numbers are added up and then divided by the number of numbers. The median is the middle value in the list of numbers. The mode is the number that occurs most often. All the three kinds of averages is used to test grades for a class you decide to find a typical score for the class. Hence, the correct option is (d) all of the above.

Hence, the options (a), (c), and (d) are incorrect. Variability refers to the extent to which data point in a data set diverge from the mean value. Variability is used to find the scores and how they spread out. Hence, the correct option is (b) variability.