Chapter 4 Cdf

Question 1

What is are two downside to Pmfs?

Answer 1

As the number of value increase, the probability associated with each value gets smaller and the effect of random noise increases.

Question 2

What is a cumulative distribution function (CDF)?

Answer 2

Is a function that maps from a value to its percentile rank.

Question 3

Given list [1, 2, 2, 3, 5], what is the CDF (1), CDF (2), CDF (3) and CDF(5)?

Answer 3

CDF (1) = 0.2
CDF (2) = 0.6
CDF (3) = 0.8
CDF (5) = 1

Question 4

What is the definition of interquartile range (IQR)?

Answer 4

Is the difference between the 75th and 25th percentiles.

Question 5

True or False. Regardless of the shape of a CDF, the distribution of percentile ranks are uniform?

Answer 5

True