Bundle: Statistics for the Behavioral Sciences, Loose-leaf Version, 10th + Aplia, 1 term Printed Access Card

10th Edition

ISBN: 9781337129039

Author: Frederick J Gravetter, Larry B. Wallnau

Publisher: Cengage Learning

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Concept explainers

Inverse Normal Distribution

The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of tw…

Mean, Median, Mode

It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency o…

Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow compar…

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Textbook Question

Chapter 3, Problem 20P

A population of N = 8 scores has a mean of = 16.

After one score is removed from the population, the

new mean is found to be = 15. What is the value of

the score that was removed? (Hint: Compare the values for EX before and after the score was removed.)

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 19P

Chapter 3, Problem 21P

Chapter 3 Solutions

Bundle: Statistics for the Behavioral Sciences, Loose-leaf Version, 10th + Aplia, 1 term Printed Access Card

Ch. 3 - Find the mean, median, and mode for the following...Ch. 3 - Find the mean, median, and mode for the following...Ch. 3 - Find the mean, median, and mode for the scores in...Ch. 3 - Find the mean, median, and mode for the scores in...Ch. 3 - For the following sample of n = 10 scores: a....Ch. 3 - A population of N = 15 scores has SX = 120. What...Ch. 3 - A sample of n = 8 scores has a mean of M = 12....Ch. 3 - A population with a mean of = 8 has SX = 40. How...Ch. 3 - One sample of n = 12 scores has a mean of M = 7...Ch. 3 - One sample has a mean of M = 8 and a second sample...

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A population of N = 8 scores has a mean of = 16. After one score is removed from the population, the new mean is found to be = 15. What is the value of the score that was removed? (Hint: Compare the values for EX before and after the score was removed.)

Solution Summary: The author explains that when one score in the population is removed, the sum and population size both will change.

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Chapter 3 Solutions