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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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Use the sample data for problems 18 & 19 & 20 .

The Natural Cereal Company claims that the average weight of is cereal boxes is at least 15oz.

If a random sample of 24 boxes produced a sample mean = 13.8 and a sample standard deviation s = 4.8, use the sample mean and standard deviation to test the claim at the 95% (? = 0.05) significance level.

Use the hypothesis H0: μ = 15 and H1: μ < 15 with a one-tail test.

18. Find the critical value for this confidence level. (A) ̶ 1.714 (C) +1.714 (B) ̶ 2.069 (D) + 2.069

19. Find the T score for the test statistic = 13.8 (A) ̶ 1.837 (C) ̶ 1.224 (B) ̶ 1.530 (D) ̶ 1.460

20. Based on the above T score – should you REJECT the null hypothesis H0? (A) YES (B) NO

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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