A researcher knows that the weights of 6-year olds are normally distributed with μ = 20.9 kg and σ = 3.2. She suspects that children in poverty-stricken regions are undernourished and therefore underweight. With a sample of n = 16 children, the researcher obtains a sample mean of M = 18.3. Use a one-tailed test and the .01 of significance to determine if the weights for this sample are significantly lower than what would be expected for the regular population of 6-year-olds. Part 1: What is z?
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