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Chapter 11: Q.64 (page 658)

The standard deviation of heights for students in a school is 0.81. A random sample of 50students is taken, and the standard deviation of heights of the sample is 0.96. A researcher in charge of the study believes the standard deviation of heights for the school is greater than 0.81.

To find the value ofdf.

Short Answer

Expert verified

The number of degrees of freedom isdf=49.

Step by step solution

01

Given Information

A random sample of 50 students is taken, and the standard deviation of the heights of the sample is 0.96.

02

Explanation

We have to find the value of degrees of freedom:

A random sample has n=50students.

Therefore, the number of degrees is :

n-1

=50-1

=49

The value of degrees of freedom isdf=49

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