The Heart of Mathematics: An Invitation to Effective Thinking

4th Edition

ISBN: 9781118156599

Author: Edward B. Burger, Michael Starbird

Publisher: Wiley, John & Sons, Incorporated

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Concept explainers

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Textbook Question

Chapter 8.1, Problem 5MS

Party time. At a nephew’s party, you decide to write down everyone’s birthday. Here are your results:

Julia1 Dec. 18 Isabel Sept. 1

Max Aug. 26 Coin Dec. 31

Melinda Oct. 1 Alexandra Mar. 14

Zack Jan. 17 Philip Dec. 9

Drew Apr. 18 Victoria July 10

Margaret June 16 Douglas Oct. 31

What percentage of children have their birthdays in December? In February? What percentage have their birthdays in the same month as another child at the party?

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Chapter 8.1, Problem 4MS

Chapter 8.1, Problem 6MS

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+900 pts /1100 Due: Tue Submit Answer Many young men in North America and Europe (but not in Asia) tend to think they need more muscle to be attractive. One study presented 200 young American men with 100 images of men with various levels of muscle. Researchers measure level of muscle in kilograms per square meter (kg/m²) of fat-free body mass. Typical young men have about 20 kg/m². Each subject chose two images, one that represented his own level of body muscle and one that he thought represented "what women prefer." The mean gap between self-image and "what women prefer" was 2.35 kg/m². Suppose that the "muscle gap" in the population of all young men has a Normal distribution with standard deviation 2.5 kg/m² Give a 90% confidence interval for the mean amount of muscle think they should add to be attractive to women (Enter your answers rounded to four decimal places.) young 00 ible lower limit = 00 upper limit = 00 00 100 100 3 # E 80 DOD F4 $ 94 55 6 MacBook Air R T Y kg/m² kg/m²…

Chapter 8 Solutions

The Heart of Mathematics: An Invitation to Effective Thinking

Ch. 8.1 - Doors galore. The 21st-century version of Lets...Ch. 8.1 - Birthday surprise. How many people would you need...Ch. 8.1 - Opposite of heads. Suppose you flip a coin 100...Ch. 8.1 - Penny percent. Suppose you flip a penny 50 times,...Ch. 8.1 - Party time. At a nephews party, you decide to...Ch. 8.1 - Flipping Lincoln. Flip a penny 100 times and...Ch. 8.1 - Flashing cards. Shuffle a standard deck of 52...Ch. 8.1 - King for a day. Remove three cards from a deck of...Ch. 8.1 - A card deal stick. Remove three cards from a deck...Ch. 8.1 - A card deal switch. Remove three cards from a deck...

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