Refer to the sample data given in Cumulative Review Exercise 1 and consider those data to be a random sample of annual lightning deaths from recent years. Use those data with a 0.01 significance level to test the claim that the mean number of annual lightning deaths is less than the mean of 72.6 deaths from the 1980s. If the mean is now lower than in the past, identify one of the several factors that could explain the decline.

Data From Cumulative Review 1:

Listed below are the numbers of deaths from lightning strikes in the United States each year for a sequence of 14 recent and consecutive years. Find the values of the indicated statistics.

a. Mean
b. Median
c. Standard deviation
d. Variance
e. Range
f. What important feature of the data is not revealed from an examination of the statistics, and what tool would be helpful in revealing it?