In an effort to investigate the premium charged by insurance companies for auto insurance, an agency randomly selects a few drivers who are insured by three different companies. These individuals have similar cars, driving records, and level of coverage. Table 14.4.1 gives the premiums paid per six months by these drivers with these three companies.
Test for equality of variances. State any assumptions you have made, and interpret your result.
Table 14.4.1 Auto Insurance Premiums

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Company l 396 438 336 318 Company II 348 360 522 Company III 378 330 294 474 432