# The best way to reduce the variances in the

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8) The best way to reduce the variances in the distributions of means when conducting an independent-samples t test is toA) increase the size of the samples.B) raise the studys level of significance.C) use the true population variance.D) treat the two samples as one sample.
9) When figuring the pooled variance in an independent-samples t test,
10) When using attable, the degrees of freedom used for an independent-samples t testis
11) An experimenter hypothesizes that biology majors score higher than literature majors on anintelligence test. If the mean score for biology majors was 18.8 and the mean score for literature majorswas 21.3, and the̅̅̅̅̅̅̅̅was .9, the t score was
Question 12 & 13 are based on the following scenario.A social psychologist interested in cultural differences compared women of two ethnic groups on a RoleApproval Index on which high scores indicated high degrees of approval ofone’sown social role. Theresults were as follows.Ethnic Group A: N = 15 M = 55 S2= 6.5Ethnic Group B: N = 15 M = 51 S2= 4.512) If an independent-samples t test is conducted, how many degrees of freedom will be used to locatethe cutoff score in the t table?A) 29B) 30C) 15D) 14
13) What is the pooled estimate of the population variance?
14) One of the assumptions for the independent-samples t test is that
15) All of the following will increase the power of a planned study using an independent-samples t testEXCEPT

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