Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 6 - Normal Probability Distributions - Review - Cumulative Review Exercises: 4

Answer

a)Bars should start at 0, vertical scaling should be decreased. b)Yes. c) Min:42, max:70, range:28, standard deviation:7.

Work Step by Step

a) The bars start at 0, not at 1. Also, the vertical scaling should be decreased, because the maximum is only approximately 15 and hence this should be the maximum on the axis. b)The distribution is normal, because the histogram is bell-shaped. c) Width of age class: 48-44=4. Hence min=44-4/2=42. max=68+4/2=70. Range=max-min=70-42=28. standard deviation=range/4=28/4=7.
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