Answered: Based on the output given, answer the…

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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Based on the output given, answer the following question.
a) Show that the standard deviation of the paired differences is 12.1879
b) Test at 5% significance level whether attending the tutorial helped to improve the
students’ performance.
c) Calculate a 95% confidence interval for the mean difference in the test score. Does the
interval support the conclusion as in b)? Explain.

Paired T for before -
after
N
Mean
StDev
SE Mean
before
10
49.3000
12.8932
4.0772
7.6478
12.1879
10
64.4000
2.4184
3.8541
after
Difference
10
-15.1000
95% upper bound for mean difference: -8.0349
T-Test of mean difference = 0 (vs < 0): T-Value = -3.92
P-Value = 0.002

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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