According to the Nuclear Energy Institute (NEI), there were 62 nuclear power plants operating in the United

Question:

According to the Nuclear Energy Institute (NEI), there were 62 nuclear power plants operating in the United States in 2015. The table at top of the next column lists the 30 states that operate nuclear power plants, the number of plants in each state, and whether the state has passed legislation supporting nuclear energy expansion (regulated) or not (deregulated).

a. Find the mean, median, and mode of the number of power plants per state. Interpret these values.

b. Repeat part a for the regulated states only.

c. Repeat part a for the deregulated states only.

d. Compare the results, parts b and c. What inference can you make about the impact that state regulation has on the number of nuclear power plants?

e. Eliminate the state with the largest number of power plants 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?

f. Arrange the 30 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, because 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?