Use the F-scale measurements of tornadoes listed in the accompanying table. The range of the data is

5.0.

Use the range rule of thumb to estimate the value of the standard deviation. Compare the result to the actual standard deviation of the data,

1.2,

assuming a difference of 0.3 or greater would mean a significant difference.

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Part 1

Using the range rule of thumb, the standard deviation is approximately

enter your response here.

(Type an integer or decimal rounded to one decimal place as needed.)

Part 2

Compare the result to the actual standard deviation.

The estimated standard deviation is

more than 0.3 greater than

within 0.3 of

more than 0.3 less than

the actual standard deviation. Thus, the estimated standard deviation

is not

is

significantly different from the actual standard deviation.