1. Find the t values that form the boundary of the critical region for a two-tailed significance test at the α = .01 significance level for a sample size n = 20.

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#1. Find the t values that form the boundary of the critical region for a two-tailed significance test at the α = .01 significance level for a sample size n = 20.

#2.

A random sample of n = 4 individuals is selected from a population with μ = 35, and a treatment is administered to each individual in the sample. After treatment, the sample mean is found to be M = 40.1 with SS = 48. Using a two-tailed test at the α = .05 significance level, does the treatment have a significant effect?

 

a. State the null and research hypotheses

b. State the critical t-values 

c. Calculate t for the sample mean

d. Evaluate the null hypothesis 

e. Calculate Cohen’s D and describe the effect size

 

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