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A dermatologist trainee investigates a certain type of skin cancer by inducing this type of cancer in 25 rats and then treating them with a

 A dermatologist trainee investigates a certain type of skin cancer by inducing this type of cancer in 25 rats and then treating them with a new type of drug. The number of hours is counted until the cancer disappears, obtaining the following results: X = 132 hours and s = 101 hours. Can it be accepted, with a confidence level of 0.9, that the mean disappearance time of cancer is 100 hours?

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