1st Edition

ISBN: 9781938168208

Author: Barbara Illowsky, Susan Dean

Publisher: OpenStax College

Concept explainers

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 7, Problem 7.8TI

Use the information In Example 7.8, but use a sample size of 55 to answer the following questions.

a. Find P ( x ¯ < 7 ) .

b. Find P ( ∑ x < 170 ) .

c. Find the 80^t^h percentile for the mean of 55 scores.

d. Find the 85^t^h percentile for the sum of 55 scores.

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Chapter 7, Problem 7.7TI

Chapter 7, Problem 7.9TI

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Use the information In Example 7.8 , but use a sample size of 55 to answer the following questions. a. Find P ( x ¯ &lt; 7 ) . b. Find P ( ∑ x &lt; 170 ) . c. Find the 80 t h percentile for the mean of 55 scores. d. Find the 85 t h percentile for the sum of 55 scores.

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Additional Math Textbook Solutions

Use the information In Example 7.8 , but use a sample size of 55 to answer the following questions. a. Find P ( x ¯ < 7 ) . b. Find P ( ∑ x < 170 ) . c. Find the 80 t h percentile for the mean of 55 scores. d. Find the 85 t h percentile for the sum of 55 scores.