Answered: Researchers are testing a new…

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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Question

Researchers are testing a new intervention to improve

study skills. Study skills are normally distributed in the

population with a mean of 30 and standard deviation of

5.5. A sample of 19 participants received the intervention

and had a mean of 40. Does the intervention significantly

improve study skills? Use an alpha of .01 and a one-tailed

test.

A. FOR THE ABOVE SCENARIO, please specify the null and alternative hypotheses.

please show all work and steps, thanks!

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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