Statistics for Business and Economics (13th Edition)

13th Edition

ISBN: 9780134506593

Author: James T. McClave, P. George Benson, Terry Sincich

Publisher: PEARSON

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A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

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Chapter 6, Problem 6.116ACB

Lead and copper in drinking water. Periodically, the Hillsborough County (Florida) Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected for a sampie of 10 residents of the Crystal Lakes Manors subdivision are shown below, followed by a Minitab printout analyzing the data.

Lead (μ g/L)	Copper (mg/L)
1 32	508
0	.279
13 1	320
919	.904
657	221
3.0	.263
1 32	475
4.09	.130
4 45	220
0	.743

Chapter 6, Problem 6.116ACB, Lead and copper in drinking water. Periodically, the Hillsborough County (Florida) Water Department , example 2

a. Locate a 90% confidence interval for the mean lead level In water specimens from Crystal Lakes Manors on the printout.
b. Locate a 90% confidence interval for the mean copper level in water specimens from Crystal Lakes Manors on the printout.
c. Interpret the intervals, parts a and b, in the words of the problem.
d. Discuss the meaning of the phrase “90% confident.”

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 6, Problem 6.115ACB

Chapter 6, Problem 6.117ACB

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Chapter 6 Solutions

Statistics for Business and Economics (13th Edition)

Ch. 6.2 - Find z/2 for each of the following: a. a . = .10...Ch. 6.2 - What is the confidence level of each of the...Ch. 6.2 - A random sample of n measurements was selected...Ch. 6.2 - A random sample of 90 observations produced a mean...Ch. 6.2 - A random sample of 70 observations from a normally...Ch. 6.2 - Use the applet Confidence Intervals for a Mean...Ch. 6.2 - Use the applet Confidence Intervals for a Mean...Ch. 6.2 - Prob. 6.6LM Ch. 6.2 - Explain the difference between an interval...Ch. 6.2 - Prob. 6.8LM

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