Statistical Techniques in Business and Economics

18th Edition

ISBN: 9781260579611

Author: Douglas Lind; William Marchal; Samuel Wathen

Publisher: MCGRAW-HILL HIGHER EDUCATION

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calcul…

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Textbook Question

Chapter 3, Problem 8E

For Exercises 7–10, (a) compute the arithmetic mean and (b) indicate whether it is a statistic or a parameter.

8. A mail-order company counted the number of incoming calls per day to the company’s toll-free number during the first 7 days in May: 14, 24, 19, 31, 36, 26, 17.

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 3, Problem 7E

Chapter 3, Problem 9E

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Chapter 3 Solutions

Statistical Techniques in Business and Economics

Ch. 3 - The annual incomes of a sample of...Ch. 3 - The six students in Computer Science 411 are a...Ch. 3 - Compute the mean of the following population...Ch. 3 - Compute the mean of the following population...Ch. 3 - a. Compute the mean of the following sample...Ch. 3 - a. Compute the mean of the following sample...Ch. 3 - Compute the mean of the following sample values:...Ch. 3 - Suppose you go to the grocery store and spend...Ch. 3 - For Exercises 710, (a) compute the arithmetic mean...Ch. 3 - For Exercises 710, (a) compute the arithmetic mean...

Ch. 3 - For Exercises 710, (a) compute the arithmetic mean...Ch. 3 - For Exercises 710, (a) compute the arithmetic mean...Ch. 3 - Prob. 11E Ch. 3 - Prob. 12E Ch. 3 - Prob. 2.1SR Ch. 3 - Prob. 2.2SR Ch. 3 - Prob. 13E Ch. 3 - Prob. 14E Ch. 3 - Prob. 15E Ch. 3 - Prob. 16E Ch. 3 - Prob. 17E Ch. 3 - Prob. 18E Ch. 3 - Prob. 19E Ch. 3 - Prob. 20E Ch. 3 - Prob. 3SR Ch. 3 - Prob. 21E Ch. 3 - Prob. 22E Ch. 3 - Prob. 4SR Ch. 3 - Prob. 23E Ch. 3 - Prob. 24E Ch. 3 - Prob. 25E Ch. 3 - Prob. 26E Ch. 3 - Prob. 5.1SR Ch. 3 - Prob. 5.2SR Ch. 3 - Compute the geometric mean of the following...Ch. 3 - Prob. 28E Ch. 3 - Listed below is the percent increase in sales for...Ch. 3 - Prob. 30E Ch. 3 - Prob. 31E Ch. 3 - Prob. 32E Ch. 3 - Prob. 33E Ch. 3 - Prob. 34E Ch. 3 - Prob. 6SR Ch. 3 - Prob. 35E Ch. 3 - Prob. 36E Ch. 3 - Prob. 37E Ch. 3 - Prob. 38E Ch. 3 - Prob. 39E Ch. 3 - Prob. 40E Ch. 3 - Prob. 7SR Ch. 3 - Prob. 41E Ch. 3 - Prob. 42E Ch. 3 - Prob. 43E Ch. 3 - Prob. 44E Ch. 3 - Plywood Inc. reported these returns on stockholder...Ch. 3 - Prob. 46E Ch. 3 - Prob. 8SR Ch. 3 - Prob. 47E Ch. 3 - Prob. 48E Ch. 3 - Prob. 49E Ch. 3 - Prob. 50E Ch. 3 - Prob. 51E Ch. 3 - Prob. 52E Ch. 3 - Prob. 9SR Ch. 3 - Prob. 53E Ch. 3 - The mean income of a group of sample observations...Ch. 3 - Prob. 55E Ch. 3 - Prob. 56E Ch. 3 - Prob. 10SR Ch. 3 - Prob. 57E Ch. 3 - Prob. 58E Ch. 3 - Prob. 59E Ch. 3 - Prob. 60E Ch. 3 - The IRS was interested in the number of individual...Ch. 3 - Prob. 62E Ch. 3 - Prob. 63CE Ch. 3 - Prob. 64CE Ch. 3 - Prob. 65CE Ch. 3 - Prob. 66CE Ch. 3 - Prob. 67CE Ch. 3 - Prob. 68CE Ch. 3 - Prob. 69CE Ch. 3 - Prob. 70CE Ch. 3 - Prob. 71CE Ch. 3 - Prob. 72CE Ch. 3 - Prob. 73CE Ch. 3 - A recent article suggested that, if you earn...Ch. 3 - Prob. 75CE Ch. 3 - Prob. 76CE Ch. 3 - Prob. 77CE Ch. 3 - Prob. 78CE Ch. 3 - The Apollo space program lasted from 1967 until...Ch. 3 - Prob. 80CE Ch. 3 - Prob. 81CE Ch. 3 - Prob. 82CE Ch. 3 - Prob. 83CE Ch. 3 - Prob. 84CE Ch. 3 - Bidwell Electronics Inc. recently surveyed a...Ch. 3 - Refer to the North Valley Real Estate data and...Ch. 3 - Prob. 87DA Ch. 3 - Refer to the Lincolnville School District bus...

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For Exercises 7–10, (a) compute the arithmetic mean and (b) indicate whether it is a statistic or a parameter. 8. A mail-order company counted the number of incoming calls per day to the company’s toll-free number during the first 7 days in May: 14, 24, 19, 31, 36, 26, 17.

Solution Summary: The author explains the arithmetic mean, which is the sum of all data values in the population.

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