Answered: A sample of 75 concrete blocks had a…

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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A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard deviation of 0.6 kg.
a) Find a 95% confidence interval for the mean mass of this type of concrete block.
b) Find a 99% confidence interval for the mean mass of this type of concrete block.
c) An engineer claims that the mean mass is between 38.2 and 38.4 kg. With what level of confidence can this statement be made?
d) How many blocks must be sampled so that a 95% confidence interval will specify the mean mass to within ±0.1 kg?
e) How many blocks must be sampled so that a 99% confidence interval will specify the mean mass to within ±0.1 kg?

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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