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Assuming that a researcher hopes to demonstrate that a treatment of group membership males

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Assuming that a researcher hopes to demonstrate that a treatment of group membership males a significant

difference in outcomes which term does the researcher hope will be larger, MS between or MS withn? Wny

 
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What type of effect can a variable

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2. What type of effect can a variable that is confounded with the treatment variable in a two-group experimental

study have on the obtained value of the t ratio?

a. It always makes t larger.

b. It usually makes t smaller.

c. It can make t either larger or smaller or leave it unchanged.

d. It generally has no effect on the size of the t ratio.

 
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Suppose you read the following in a journal

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Suppose you read the following in a journal: “The group means did not differ significantly, t(30.1) = 1.68, p <

.05, two-tailed.” You notice that the ns in the groups were n1 = 40 and n2 = 55.

a.What degrees of freedom would you normally expect a t test to have when n1 = 40 and n2 = 55?

b.How do you explain why the degrees of freedom reported here differ from the value you just calculated

 
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probability

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17. When a researcher reports a p value, “p” stands for “probability” or risk.a.

What probability does this p refer to?

b. Do we typically want p to be large or small?

c. What is the conventional standard for an “acceptably small” p

value?

 
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