1. A treatment is administered to a sample of n=25 selected from a population wi

Question

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

Explanation / Answer

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.

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