September 2009

3.12

3.12

3.11

3.08

3.08

3.07

3.06

3.03

2.99

2.98

2.97

2.93

2.89

2.79

2.Describe the shape of the data (skewed right, symmetric, etc.). Is there anything unusual in the data? Do there appear to be any outliers? Is the data uniform, clustered, or spread out? Are there any gaps in the data?

3.What is the mean of the data? Put the number in a sentence. Explain which center value, the mean or the median, would have been best for the data, based on the graph you created.

4.What is the variance of the sample for the data? Put the number in a sentence.

(i.e. - "The sample variance for the September gas prices was ____.")

5.What is the standard deviation of the sample for the data? Put the number in a sentence.

6.What is the Coefficient of Variation for the sample? Put the number in a sentence.

7.Find the z-value for a gas price of $3.08, using the mean and standard deviation you calculated for September gas data. Put the number in a sentence.

8.Find the z-value for a gas price of $3.00, using the mean and standard deviation you calculated for September gas data. Put the number in a sentence.