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A line representing any polynomial function, power function (including negative powers), trigonometric functions, most continuous probability distribution functions.
Using just the number line, the only option is to draw some symbols on the number line wherever a data point is observed. It is not easy to show multiple occurrences on a one-dimensional figure.
Yes. When we refer to the normal distribution, we are referring to a probability distribution. When we specify the equation of a continuous distribution, such as the normal distribution, we refer to the equation as a probability density function.
The statement is true that a sampling distribution is a probability distribution for a statistic.
No, it is the name given to the Gaussian distribution.