According to a national survey of 1,441 firms by the American Management Association, downsizing is no longer the dominant theme in the workplace (Newark Star-Ledger, Oct. 22,1996). But are there regional differences in this phenomenon? Is there more growth in jobs in the Sunbelt than the Rustbelt? Assuming equal sample sizes for the two regions, how large would the samples in the proportion of next year in the two interval of width no more of life in California, where scientists have warned about "the big one" for decades. An article in the Annals of the Association of American Geographers (June 1992) investigated what influences homeowners in purchasing earthquake insurance. One factor investigated was the proximity to a major fault.The researchers hypothesized that the nearer a county is to a major fault, the more likely residents are to own earthquake insurance. Suppose that a random sample of 700 earthquake-insured residents from four California counties is selected, and the number in each county is counted and recorded in the table:

855 Research indicates that the highest priority of retirees is travel. A study in the Annals of Tourism Research (Vol.
19,1992) investigates the relationship of retirement status (pre- and postretirement) to various items related to the travel industry. One part of the study investigated the differences in the length of stay of a trip for pre- and postretirees. A sample of 703 travelers were asked how long they stayed on a typical trip. The results are shown in the next table. Use the information in the table to determine whether the retirement status of a traveler and the duration of a typical trip are dependent.Test using a = .05.