# Question

The U.S. Energy Information Administration monitors all nuclear power plants operating in the United States. The table below lists the number of active nuclear power plants operating in each of a sample of 20 states. All of the data are saved in the NUCLEAR file.

a. Find the mean, median, and mode of this data set.

b. Eliminate the largest value from the data set and repeat part a. What effect does dropping this measurement have on the measures of central tendency found in part a?

c. Arrange the 20 values in the table from lowest to highest. Next, eliminate the lowest two values and the highest two values from the data set, and find the mean of the remaining data values. The result is called a 10% trimmed mean, since it is calculated after removing the highest 10% and the lowest 10% of the data values. What advantages does a trimmed mean have over the regular arithmetic mean?

a. Find the mean, median, and mode of this data set.

b. Eliminate the largest value from the data set and repeat part a. What effect does dropping this measurement have on the measures of central tendency found in part a?

c. Arrange the 20 values in the table from lowest to highest. Next, eliminate the lowest two values and the highest two values from the data set, and find the mean of the remaining data values. The result is called a 10% trimmed mean, since it is calculated after removing the highest 10% and the lowest 10% of the data values. What advantages does a trimmed mean have over the regular arithmetic mean?

## Answer to relevant Questions

What is the primary disadvantage of using the range to compare the variability of data sets? Compute s2, and s for each of the data sets listed. Where appropriate, specify the units in which your answer is expressed. a. 3, 1, 10, 10, 4 b. 8 feet, 10 feet, 32 feet, 5 feet c. −1, −4, −3, 1, −4, −4 d. 1/5 ...The following is a sample of 25 measurements. The data are saved in the LM2_94 file. a. Compute x-bar, s2, and s for this sample. b. Count the number of measurements in the intervals x-bar ± s, x-bar 2s, and x-bar 3s. ...For a quantitative data set a. What is the 50th percentile called? b. Define QL. c. Define Qu. With mound-shaped data, what proportion of the measurements have z-scores between –3 and 3?Post your question

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