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By Kelley W.M., Donnelly R.

ISBN-10: 1592578659

ISBN-13: 9781592578658

A mind explains... such a lot math and technological know-how research publications are dry and tough, yet this is often the exception. Following the profitable The Humongous Books in calculus and algebra, bestselling writer Mike Kelley takes a regular information workbook, choked with solved difficulties, and writes notes within the margins, including lacking steps and simplifying innovations and ideas. by way of studying the right way to interpret and remedy difficulties as they're awarded in statistics classes, scholars arrange to resolve these tough difficulties that have been by no means mentioned in school yet are continuously on tests. •With annotated notes and factors of lacking steps all through, like no different records workbook out there • An award-winning former math instructor whose site (calculus-help. com) reaches millions each month, delivering publicity for all his books

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Extra resources for The humongous book of statistics problems

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One student dropped the class, changing the average exam score of the remaining students to 90. What was the exam score of the student who dropped the class? Calculate the sum of the exam scores for the original 10 students.  Xgdhh"bjai^eani]Z [Vb^a^VgbZVc ZfjVi^dc The same equation can be used to calculate the sum of the exam scores for the remaining nine students. idhdakZ^i[dg I]Z=jbdc\djh7dd`d[HiVi^hi^XhEgdWaZbh  # 29 Chapter Two — Calculating Descriptive Statistics: Measures of Central Tendency The difference of the sums is 850 – 810 = 40, so the student who dropped the course had an exam score of 40.

22 The table below lists the number of minutes the last 10 customers to call a company waited on hold for technical support over the phone. Describe the central tendency of the data in two different, and appropriate, ways. Minutes on Hold 17 8 10 20 16 5 18 12 15 6 Because there do not appear to be any extreme values in this data set, the mean is an appropriate choice to measure central tendency. Zm^hih h  l]ZcdcZYViVed ^ci h^\c^ÒXVcian]^\]Z ^h gdg adlZgi]Vci]ZgZ hi i]ZYViVhZi#Dj d[ ia^ l^aaWZXdkZgZY^c Zgh bd YZiV^a^c8]VeiZg gZ (# You can also use the median to describe the central tendency of the data.

42 The following table divides the employees at a company into categories according to their ages. Approximate the mean employee age. Age Range Number of Employees 20–24 8 25–29 37 30–34 25 35–39 48 40–44 27 45–49 10 Identify the midpoint of each age range. Age Range Midpoint Number of Employees 20–24 22 8 25–29 27 37 30–34 32 25 35–39 37 48 40–44 42 27 45–49 47 10 Multiply the midpoints of each range by the corresponding frequencies and then calculate the mean of the products. 5 years. 43 The NFL has played a 16-game schedule every year from 1978 to 2007, excluding the strike-shortened 1982 season.

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