The Environmental Protection Agency is studying coliform bacteria counts at the beaches of a large suburban county. Three types of beaches are to be considered (ocean, bay, and sound) in three geographic areas of the county (west, central, and east). Two beaches of each type are randomly selected in each region of the county. The coliform bacteria counts (in parts per thousand) at each beach on a particular day were as shown in the table.

(a) Use the .05 level of significance and determine (1) whether there is an effect due to type of beach, (2) whether there is an effect due to geographic area, and (3) whether interaction between type of beach and geographic area has an effect.

(b) What conclusions about average bacteria count do the results support?

Transcribed Image Text:

Type of beach Ocean Bay Sound Geographic area West 25 20 32 39 27 30 Central 9 6 18 24 16 21 East 3 6 9 13 5 7