Answered: It is known that the scores of an exam…

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

It is known that the scores of an exam vary in a certain population with values according to a normal distribution of unknown mean and standard deviation. In a sample of 20 grades from this population, the following results were obtained:

a. Considering the 99.5% two-sided confidence interval for the mean exam score of a certain population, what is the lower bound of this interval?
b. Considering the two-sided 99.5% confidence interval for the mean exam score of a certain population, what is the upper limit of this interval?
c. With the information obtained in this sample, calculate what would be the margin of error of a 99.8% confidence interval for the mean score on the exam of a certain population.

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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