Intro Stats, Books a la carte Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (5th Edition)

5th Edition

ISBN: 9780134210247

Author: Richard D. De Veaux, Paul Velleman, David E. Bock

Publisher: PEARSON

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Textbook Question

Chapter 5, Problem 4E

Placement exams An incoming freshman took her college’s placement exams in French and mathematics. In French, she scored 82 and in math 86. The overall results on the French exam had a mean of 72 and a standard deviation of 8, while the mean math score was 68, with a standard deviation of 12. On which exam did she do better compared with the other freshmen?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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Chapter 5, Problem 3E

Chapter 5, Problem 5E

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Chapter 5 Solutions

Intro Stats, Books a la carte Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (5th Edition)

Ch. 5.1 - Your statistics teacher has announced that the...Ch. 5.1 - A distribution of incomes shows a strongly right...Ch. 5.2 - Prob. 3JC Ch. 5.2 - Prob. 4JC Ch. 5.3 - As a group, the Dutch are among the tallest people...Ch. 5.3 - Prob. 6JC Ch. 5.3 - The mean of our original sample of 100 commute...Ch. 5.3 - Prob. 8JC Ch. 5 - Stats test The mean score on the Stats exam was 75...Ch. 5 - Mensa People with z-scores above 2.5 on an IQ test...

Ch. 5 - Temperatures A towns January high temperatures...Ch. 5 - Placement exams An incoming freshman took her...Ch. 5 - Shipments A company selling clothing on the...Ch. 5 - Hotline A companys customer service hotline...Ch. 5 - Prob. 7E Ch. 5 - Prob. 8E Ch. 5 - Guzzlers? Environmental Protection Agency (EPA)...Ch. 5 - IQ Some IQ tests are standardized to a Normal...Ch. 5 - Prob. 11E Ch. 5 - Stats test Suppose your statistics professor...Ch. 5 - Normal cattle The Virginia Cooperative Extension...Ch. 5 - IQs revisited Based on the Normal model N(100, 15)...Ch. 5 - ACT scores The Mathematics section of the ACT test...Ch. 5 - Prob. 16E Ch. 5 - Prob. 17E Ch. 5 - Wisconsin ACT 2015 The histogram shows the...Ch. 5 - Payroll Here are the summary statistics for the...Ch. 5 - Hams A specialty foods company sells gourmet hams...Ch. 5 - Prob. 21E Ch. 5 - Prob. 22E Ch. 5 - Prob. 23E Ch. 5 - Windy In the last chapter, we looked at three...Ch. 5 - Prob. 25E Ch. 5 - Combining scores again The first Stat exam had a...Ch. 5 - Final exams Anna, a language major, took final...Ch. 5 - Prob. 28E Ch. 5 - Prob. 29E Ch. 5 - Car speeds 100 John Beale of Stanford, California,...Ch. 5 - Prob. 31E Ch. 5 - Prob. 32E Ch. 5 - Prob. 33E Ch. 5 - Prob. 34E Ch. 5 - Prob. 35E Ch. 5 - Prob. 36E Ch. 5 - Small steer In Exercise 29, we suggested the model...Ch. 5 - Prob. 38E Ch. 5 - Trees A forester measured 27 of the trees in a...Ch. 5 - Rivets A company that manufactures rivets believes...Ch. 5 - Prob. 41E Ch. 5 - Car speeds 100, the picture For the car speed data...Ch. 5 - Winter Olympics 2014 Thirty-four men completed the...Ch. 5 - Check the model The mean of the 100 car speeds in...Ch. 5 - Receivers 2015 NFL data from the 2015 football...Ch. 5 - Prob. 46E Ch. 5 - Prob. 47E Ch. 5 - Prob. 48E Ch. 5 - More cattle Based on the model N(1152, 84)...Ch. 5 - More IQs In the Normal model N(100, 15) from...Ch. 5 - Prob. 51E Ch. 5 - IQ, finis Consider the IQ model N(100, 15) one...Ch. 5 - Cholesterol Assume the cholesterol levels of adult...Ch. 5 - Tires A tire manufacturer believes that the...Ch. 5 - Kindergarten Companies that design furniture for...Ch. 5 - Prob. 56E Ch. 5 - Eggs Hens usually begin laying eggs when they are...Ch. 5 - Tomatoes Agricultural scientists are working on...

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Solution Summary: The author explains that the freshman scored 82 and 86 in French and Math, respectively. The z-score of the student in Math is higher than the one in the French examination.

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