1.) A researcher administers a treatment to sample of n = 16 selected from a population with m = 40 and s = 8. If the sample mean after treatment is M = 42, then Cohen's d = 1.00. True or False?
2.) A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis?
A: s = 5 and n = 50
B: s = 5 and n = 25
C: s = 10 and n = 50
D: s = 10 and n = 25
3.) A sample of n = 16 individuals is selected from a population with m = 60 and s = 6 and a treatment is administered to the sample. After treatment, the sample mean is M = 63. What is the value of Cohen's d for this sample?
A: 3.00
B: 2.00
C: 0.33
D: 0.50