Alex's times for running a mile are Normally distributed with a mean time of 5.28 minutes and a standarddeviation of 0.38 seconds. Chris's times for running a mile are Normally distributed with a mean time of 5.45seconds and a standard deviation of 0.2 seconds. Ten of Alex's times and 15 of Chris's times are randomlyselected. Let i, -i, represent the difference in the mean times for Alex and Chris. Which of the followingrepresents the standard deviation of the sampling distribution for i,-?0.090.130.170.18

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Answered: Alex's times for running a mile are…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1544 and the standard deviation was 314.The test scores of four students selected at random are 1940, 1290, 2250,and 1420.Find the z-scores that correspond to each value and determine whether any of the values are unusual. (Round to 2 decimal places as needed.)
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