1) A random sample of n = 12 individuals is selected from a population with µ =

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1) A random sample of n = 12 individuals is selected from a population with µ = 70 and a treatment is administered to each individual in the sample. After treatment the sample mean is found to be M = 74.5 with S = 5.20
Based on the sample data, does the treatment have a significant effect.? Use a two tailed test with α = 0.05
steps
a) State the Null and the Alternate Hypotheses
b) Calculate the estimated standard error of the mean
c) Identify the critical t value ( use α = 0.05 ) and critical region
d) Compute the t statistics
e) Make a decision about the Null hypothesis

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