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Name: The average length of time for students to register during the enrolme
Uploaded: 2024-03-20T07:07:12.000Z
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Description: The average length of time for students to register during the enrolment at a certain college has been 70 minutes. A new registration procedure using modern computing machines is being tried. If a random sample of 61 students had an average registrat

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 average length of time for students to register during the enrolment at a certain college has been 70 minutes. A new registration procedure using modern computing machines is being tried. If a random sample of 61 students had an average registration time of 58 minutes with a standard deviation of 15.9 minutes under the new system, test the hypothesis that the mean is now less than 70, using a level of significance of 0.05. Assume the population of times to be normal.

Is this a one-tailed or two-tailed test? What test statistic is to be used? What is the decision rule?

What is the computed value of the test statistic?

What is your decision/conclusion regarding the null hypothesis?

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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