Share
Explore BrainMass

Calculating Dispersion and Confidence Intervals

Gas Price Gas Price Gas Price
\$3.76 \$3.99 \$4.25
\$3.79 \$3.99 \$4.25
\$3.79 \$4.00 \$4.25
\$3.80 \$4.00 \$4.25
\$3.81 \$4.03 \$4.25
\$3.82 \$4.05 \$4.29
\$3.84 \$4.05 \$4.29
\$3.85 \$4.07 \$4.29
\$3.86 \$4.08 \$4.29
\$3.87 \$4.09 \$4.29
\$3.87 \$4.09 \$4.36
\$3.87 \$4.09 \$4.36
\$3.89 \$4.09 \$4.36
\$3.89 \$4.11 \$4.36
\$3.89 \$4.11 \$4.37
\$3.89 \$4.11 \$4.37
\$3.89 \$4.13 \$4.37
\$3.91 \$4.14 \$4.38
\$3.91 \$4.15 \$4.38
\$3.93 \$4.15 \$4.38
\$3.93 \$4.17 \$4.39
\$3.93 \$4.18 \$4.39
\$3.95 \$4.18 \$4.40
\$3.95 \$4.19 \$4.41
\$3.95 \$4.19 \$4.41
\$3.95 \$4.19 \$4.41
\$3.98 \$4.19 \$4.43
\$3.98 \$4.19 \$4.43
\$3.99 \$4.21 \$4.44
\$3.99 \$4.23 \$4.44
Please calculate Part A #3,4 and Part B #3.
Thanks

Part A
3. Calculate the dispersion (standard deviation and Range). Identify the 1, 2, and 3 Sigma ranges for each sample.
4. Group the data and set up frequency tables for each sample. Again calculate the same items done in #2 and #3 above for the group data. Compare the results with the results from#2(mode,mean,median) and #3. Show your calculations please.

Part B
3. Calculate the 95% confidence interval for all samples.

Solution Summary

This solution shows step-by-step calculations to determine the dispersion (standard deviation and range) and the 95% confidence interval for all samples. It also compares the group data in frequency tables.

\$2.19