Answered: Refer to the technology output given to…

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

Refer to the technology output given to the right that results from measured hemoglobin levels (g/dL) in

100

randomly selected adult females. The confidence level of

95%

was used.

a. What is the number of degrees of freedom that should be used for finding the critical value

tα/2?

b. Find the critical value

tα/2

corresponding to a

95%

confidence level.

c. Give a brief description of the number of degrees of freedom.

TInterval

(13.040,13.512)

x=13.276

Sx=1.189

n=100

a. What is the number of degrees of freedom that should be used for finding the critical value

tα/2?

There are

9999

degrees of freedom.

(Type a whole number.)

b. Find the critical value

tα/2

corresponding to a

95%

confidence level.

tα/2=1.981.98

(Round to two decimal places as needed.)

c. Give a brief description of the number of degrees of freedom. Choose the correct answer below.

The number of degrees of freedom is the number of sample values.

The number of degrees of freedom is a value from the t distribution that modifies the margin of error when finding the upper and lower limits of the confidence interval.

The number of degrees of freedom is the number of sample values that can vary after certain restrictions have been imposed on all data values.

Your answer is correct.

The number of degrees of freedom is the number of different ways that the sample could be arranged.

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