Answered: weight of a randomly selected bag has 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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Question

Let x₁, x₂, . . . , x₁₀₀ denote the actual net weights (in pounds) of 100 randomly selected bags of fertilizer. Suppose that the weight of a randomly selected bag has a distribution with mean 75 lbs and variance 1 lb². Let x be the sample mean weight

(n = 100).

(a)

Describe the sampling distribution of x.

The distribution is approximately normal with a mean of 75 lbs and variance of 1 lb².The distribution is approximately normal with a mean of 75 lbs and variance of 0.01 lbs². The distribution is unknown with a mean of 75 lbs and variance of 0.01 lbs².The distribution is unknown with a mean of 75 lbs and variance of 1 lb².The distribution is unknown with unknown mean and variance.

(b)

What is the probability that the sample mean is between 74.65 lbs and 75.35 lbs? (Round your answer to four decimal places.)

P(74.65 ≤ x ≤ 75.35) =

(c)

What is the probability that the sample mean is greater than 75 lbs?

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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