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Description: the average IQ of an adult is 100 A research phychologist devised a course to improve IQ's a group of 10 ramdomly cholsen adults took the course and at the end of the course their IQ's were measured. The average IQ score for the class was ramdom sam

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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the average IQ of an adult is 100 A research phychologist devised a course to improve IQ's a group of 10 ramdomly cholsen adults took the course and at the end of the course their IQ's were measured. The average IQ score for the class was ramdom sample=110.9. Let x be a ramdom variable that represents the IQ score of an adult who takes the course you may assume that x has a normal distribution with standard deviation=15 does the above sample result provide convincing evidence that adults who take the course have a mean IQ score greater than 100? use level 1% level of significance.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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