Answered: I wanted to test if the mean Exam 3…

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

I wanted to test if the mean Exam 3 score in this course was different than the mean Exam 2 score. I then did a different test than the previous questions. I instead used the 30 students in my course last semester as my sample for Exam 3, and I used a sample of 25 students from this class as my sample for Exam 2. The sample mean score for Exam 2 was 84.0 with a standard deviation of 2.0, and the sample mean score for Exam 3 was 82.0 with a standard deviation of 1.8. What is the t-value used in the 95% confidence interval for the mean difference between Exam 2 and Exam 3?

Group of answer choices

2.045

2.064

2.042

2.060

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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