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National health guidelines recommend women drink 8 cups of water per day. In a random sample of 22 women, the sample mean amount of water drunk per day was 6.19 cups with a sample standard deviation of 2.48. Our goal is to test whether there is sufficient evidence that the population mean amount of water drunk per day (It) is less than 8 cups. That is, we are testing Ho : p. = 8 versus HA ; p.