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Molodets [167]
3 years ago
8

Calculating the degrees of freedom, the sample variance, and the estimated standard error for evaluations.

Mathematics
1 answer:
ki77a [65]3 years ago
4 0

Answer:

The variance is  \sigma ^2  =25

Step-by-step explanation:

From the question we are told that

    The sample size is  n =  21

     The sum of squares is SS =  500

Generally the variance is mathematically represented as

           \sigma ^2  = \frac{SS}{n- 1}

substituting values

          \sigma ^2  = \frac{ 500}{21- 1}

          \sigma ^2  =25

   

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