Answered: Which of these variables is least…

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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Question

(a) Which of these variables is least likely to have a Normal distribution?

A. Income per person for 150 different countries.
B. Heights of 100 white pine trees in a forest.
C. Lengths of 50 newly hatched pythons.
D. None of the above.

(B) To completely specify the shape of a Normal distribution, you must give

A. the median and the standard deviation.
B. the five-number summary.
C. the mean and the standard deviation.
D. the mean and the median.
E. All of the above

(c) The scores of adults on an IQ test is approximately Normal with mean 100 and standard deviation 15. Corinne scores 118 on such test. Her z-score is about

A. 1.2
B. 0.67
C. 18
D. 7.87
E. None of the above.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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