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Chapter 3: Q. 3.125 (page 123)

The data set has size 80. Approximately how many observations lie within two standard deviations to either side of the mean?

Short Answer

Expert verified

The observations that lie within two standard deviations to either side of the mean approximately are76

Step by step solution

01

Given information

We are given that data set has size80

02

Explanation

Here we will use Empirical Rule , for normally distributed random variable, 95%of the measures are within two standard deviation of the mean.

We are given the size of data set to be80 , as here distributions are normal ,

So we get ,0.95脳80=76

Approximately,76observation lie within two standard deviations of the mean

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