Mathematics, 22.07.2021 22:40, xdimplesjoon

a mean of μ = 78 points with σ = 9. She collects a sample mean of M = 84 for app users. What is the null hypothesis, in both words and symbols?

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a mean of μ = 78 points with σ = 9. She collects a sample mean of M = 84 for app users. What is the...