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Name: Some researchers claim that herbal supplements improve human memory. T
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Description: Some researchers claim that herbal supplements improve human memory. To test this claim, a researcher selects a sample of n = 25 college students. Each student is given herbal supplements daily for 6 weeks and then all the participants are given a st

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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Some researchers claim that herbal supplements improve human memory. To test this claim, a researcher selects a sample of n = 25 college students. Each student is given herbal supplements daily for 6 weeks and then all the participants are given a standardized memory test. For the population, scores on the tests are normally distributed with µ = 70 and σ= 20. The sample of n = 25 students had a mean score of M = 80. Can we conclude that the memory scores of the sample after the “herbal supplement” treatment are significantly greater than those of the general population(population mean before treatment)? Perform a hypothesis test using a z- score statistic. Use a one-tailed test with α = .05.

What is alternate hypothesis symbol and z score ?

And final decision?

A.Fail to reject the null hypothesis and conclude that the memory scores of the sample after the “herbal supplement” treatment are significantly greater than those of the general population

B.Fail to reject the null hypothesis and conclude that the memory scores of the sample after the “herbal supplement” treatment are not significantly greater than those of the general population

C.Reject the null hypothesis and conclude that the memory scores of the sample after the “herbal supplement” treatment are significantly greater than those of the general population

D.Reject the null hypothesis and conclude that the memory scores of the sample after the “herbal supplement” treatment are not significantly greater than those of the general population

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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