Answered: A simple random sample with n= 50…

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 simple random sample with n= 50 provided a sample mean of 22.5 and a sample standard deviation of 4.2.

a. Develop a 90% confidence interval for the population mean (to 1 decimal).

b. Develop a 95% confidence interval for the population mean (to 1 decimal).

c. Develop a 99% confidence interval for the population mean (to 1 decimal).

d. What happens to the margin of error and the confidence interval as the confidence level is increased?

- Select your answer -

They increase

They decrease

They stay the same

It cannot be determined from the given data

The margin of error increases and the confidence interval becomes narrower

The margin of error decreases and the confidence interval becomes widerItem 7 .

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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