Homework Sourse1 A treatment is administered to a sample of n25 selected fr
1. A treatment is administered to a sample of n=25 selected from a population with a mean of u=80 and a standard deviation of theta=10 After treatment the sample mean is M =85 if the effect size is measured by cohens d what is the value of d
A. d=5.00
B. d=2.50
C. d=0.50
D. Impossible to calculate without more information
2. If a hypothesis test produces a z- score in the critical region how should the results be reported in the literature
A. A Significant treatment effect of with P<.05
B. No significant treatment effect with p>.05
C. No significant treatment effect with p<.05
D. A significant treatment effect with p>.05
1. A treatment is administered to a sample of n=25 selected from a population with a mean of u=80 and a standard deviation of theta=10 After treatment the sample mean is M =85 if the effect size is measured by cohens d what is the value of d
A. d=5.00
B. d=2.50
C. d=0.50
D. Impossible to calculate without more information
2. If a hypothesis test produces a z- score in the critical region how should the results be reported in the literature
A. A Significant treatment effect of with P<.05
B. No significant treatment effect with p>.05
C. No significant treatment effect with p<.05
D. A significant treatment effect with p>.05
1. A treatment is administered to a sample of n=25 selected from a population with a mean of u=80 and a standard deviation of theta=10 After treatment the sample mean is M =85 if the effect size is measured by cohens d what is the value of d
A. d=5.00
B. d=2.50
C. d=0.50
D. Impossible to calculate without more information
2. If a hypothesis test produces a z- score in the critical region how should the results be reported in the literature
A. A Significant treatment effect of with P<.05
B. No significant treatment effect with p>.05
C. No significant treatment effect with p<.05
D. A significant treatment effect with p>.05
Solution
1) n = 25
u = 80
theta (standard deviation) = 10
M = 85
d can be written as,
d = (M - u) / theta
d = (85 - 80)/10 = 5/10 = 0.5
option C) is correct.
z-score formula is,
z = (M - u) / (theta/sqrt(n) )
z = (85 - 80) / (10/sqrt(25))
z = 2.5
We can find P-value by using EXCEL syntax is,
=1 - NORMSDIST(z)
where, z is the test statistic value.
P-value = 0.006
alpha = 0.05
P-value < 0.05
A significant treatment effect of with P < 0.05.
option A) is correct.
