# Range, Interquartile Range, Variance, Standard Deviation

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The Los Angeles Times regularly reports the air quality index for various areas of Southern california. A sample of air quality index values for Pomona provided the following data: 28, 42, 58, 48, 45, 55, 60, 49, and 50.

1. Compute the range and interquartile range.

2. Compute the sample variance and sample standard deviation.

3. A sample of air quality index readings for Anaheim provided a sample mean 48.5, a sample variance of 136, and a sample standard deviation of 11.66. What comparisons can you make between the air quality in Pomona and that in Anaheim on the basis of these desciptive statistics?

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Problem:

The Los Angeles Times regularly reports the air quality index for various areas of Southern California. A sample of air quality index values for Pomona provided the following data: 28, 42, 58, 48, 45, 55, 60, 49, and 50.

1. Compute the range and interquartile range.

2. Compute the ...

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