The scores on a (hypothetical) vocabulary test of a group of 20 year old’s and a group of 60 year old’s are shown below. 20 yr olds60 yr olds2726262921292429152718161720122713 a) Test the mean difference for significance using the .05 leve).b) List the assumptions made in computing your answer.

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Description: The scores on a (hypothetical) vocabulary test of a group of 20 year old’s and a group of 60 year old’s are shown below. 20 yr olds60 yr olds2726262921292429152718161720122713 a) Test the mean difference for significance using the .05 leve).b) List

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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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The scores on a (hypothetical) vocabulary test of a group of 20 year old’s and a group of 60 year old’s are shown below.

20 yr olds	60 yr olds
27	26
26	29
21	29
24	29
15	27
18	16
17	20
12	27
13

a) Test the mean difference for significance using the .05 leve).

b) List the assumptions made in computing your answer.

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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