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A real estate broker wants to analyze the real estate prices in GTA. She took a random sample of 25 houses in richmond hill and another random sample of 22 houses in mississauga. the sample means (in $ thousands) are richmond hill is 502, and mississauga is 486. the population standard deviation are richmondhill 98.1 and mississauga is 77.4. can she claim a 3% significance level that the average price in richmond hill is higher than average price in mississauga? use z-test independent samples. use formula zst=