Answered: One year, the mean age of an inmate on…

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

One year, the mean age of an inmate on death row was

40.1

years. A sociologist wondered whether the mean age of a death-row inmate has changed since then. She randomly selects

death-row inmates and finds that their mean age is

38.3

with a standard deviation of

8.9

Construct a 95% confidence interval about the mean age. What does the interval imply?

Click the icon to view the table of critical t-values.

Choose the correct hypotheses.

Upper H 0H0:

▼

sigmaσ

x overbarx

muμ

▼

equals=

less than<

not equals≠

greater than>

nothing

Upper H 1H1:

▼

sigmaσ

muμ

x overbarx

▼

less than<

greater than>

not equals≠

equals=

nothing

(Type integers or decimals. Do not round.)

Construct a 95% confidence interval about the mean age.

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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