A random sample is selected from a normal population with a mean of μ = 40 and a standard deviation of σ = 10. A treatme

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A random sample is selected from a normal population with a mean
of μ = 40 and a standard deviation of σ = 10. A treatment is
administered to the individuals in the sample. The sample mean is
found to be M = 46. How large a sample is necessary for this sample
mean to be statistically significant? Assume a two-tailed test with
α = .05, and use the Distributions tool to help.
The sample size must be than ; a sample of n = or larger is
needed.
If the sample mean were M = 43, what sample size is needed to be
significant for a two-tailed test with α = .05?
The sample size must be than ; a sample of n = or larger is
needed.