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 99% was used.

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

ta/2?

b. Find the critical value ta/2 corresponding to a 99% confidence level.

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

a. What is the number of degrees of freedom that should be used for finding the critical value t/2?

There are 99 degrees of freedom.

(Type a whole number.)

b. Find the critical value a/2 corresponding to a 99% confidence level.

4

ta/2= (Round to two decimal places as needed.)

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

Tinterval

(13.128.13.714)

x = 13.421

Sx= 1.116

n=100

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

OB. 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.

OC. 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.

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

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