Answered: The weights of four randomly and…

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 weights of four randomly and independently selected bags of potatoes labeled 20.0 pounds were found to be 20.9, 21.5, 20.5, and 21.2 pounds. Assume Normality. Answer parts (a) and (b) below.

a. Find a 95% confidence interval for the mean weight of all bags of potatoes. (Type integers or decimals rounded to the nearest hundredth as needed. Use ascending order.)

b. b. Does the interval capture 20.0 pounds? Is there enough evidence to reject a mean weight of 20.0 pounds?

The weights of four randomly and independently selected bags of potatoes labeled 20.0 pounds were found to be 20.9, 21.5, 20.5, and 21.2 pounds. O Assume Normality. Answer parts (a) and (b) below.
a. Find a 95% confidence interval for the mean weight of all bags of potatoes.
OD
(Type integers or decimals rounded to the nearest hundredth as needed. Use ascending order.)
b. Does the interval capture 20.0 pounds? Is there enough evidence to reject a mean weight of 20.0 pounds?
O A. The interval captures 20.0 pounds, so there is enough evidence to reject a mean weight of 20.0 pounds. It is not plausible the population mean weight is 20.0 pounds.
O B. The interval does not capture 20.0 pounds, so there is enough evidence to reject a mean weight of 20.0 pounds. It is not plausible the population mean weight is 20.0 pounds.
O c. The interval captures 20.0 pounds, so there is not enough evidence to reject a mean weight of 20.0 pounds. It is plausible the population mean weight is 20.0 pounds.
O D. The interval does not capture 20.0 pounds, so there not is enough evidence to reject a mean weight of 20.0 pounds. It is plausible the population mean weight is 20.0 pounds.
O E. There is insufficient information to make a decision regarding the rejection of 20.0 pounds. The sample size of 4 bags is less than the required 25.

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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