One of many activities of birdwatchers is to count the number of birds of various species along a specified route. Table 10.34 shows the total number of birds of all species observed by birdwatchers...

One of many activities of birdwatchers is to count the number of birds of various species along a specified route. Table 10.34 shows the total number of birds of all species observed by birdwatchers for routes in three different cities observed at Christmas for each of the 25 years from 1965 through 1989. It is of interest to examine the year-to-year differences and especially to see whether there has been an upward or downward trend over these years. This is a randomized block design with routes (cities) as blocks.

Perform the analysis for studying the effect of years. Check assumptions and perform an alternative analysis if necessary. Interpret results.