Answered: A researcher would like to determine…

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 researcher would like to determine whether an over-the-counter cold
medication has an effect on mental alertness. A sample of n= 25 participants is obtained,
and each person is given a standard dose of the medication one hour before being tested in
a driving simulation task. For the general population, scores on the simulation task are
normally distributed with μ= 75 and σ= 15. The individuals in the sample had an average
score of M= 65.5. Can the researcher conclude that scores on the driving simulation task
are significantly different after taking the medication? Use a two-tailed test with α = .05.
Perform all 4 steps of hypothesis testing

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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