Which of the following is false? Hint: It might be useful to sketch the distributions. Z scores are defined for observations from distributions of any shape and skew. The Z score for the median of a left skewed distribution is negative. The Z score for the median of a symmetric distribution is approximately 0. Calculating percentiles based on the Z table is only appropriate for observations that come from a nearly normal distribution.

Answered: Which of the following is false? Hint:…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Which of the following is false? Hint: It might be useful to sketch the distributions.

Z scores are defined for observations from distributions of any shape and skew.
The Z score for the median of a left skewed distribution is negative.
The Z score for the median of a symmetric distribution is approximately 0.
Calculating percentiles based on the Z table is only appropriate for observations that come from a nearly normal distribution.

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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