If a study has 18 participants in the experimental group and 7 in the control gr

Question

If a study has 18 participants in the experimental group and 7 in the control group, the harmonic mean will be closest to a value of A)5 B)7 C)18 D)25 The items below are based on t he following scenario. A social psychologist interested in cultural differences compared women of two ethnic groups on a Role Approval Index on which high scores indicated high degrees of approval of one's own social role. The results were as follows. Ethnic Group A: N = 15. M = 55, S^2 = 6.5 Ethnic Group B: N = 23, M = 51, S^2 = 4.5 2.)If a t test for independent means is conducted, how many degrees of freedom will be used to locate the cutoff score in the t table? A) (15 - 1) + (23 - 1) = 36 B)15 + 23 = 38 C)(I5 + 23) - 1 = 37 D)(15 + 23)/2 = 19 3.)What is the pooled estimate of the population variance? A)((14/36) (6.5)] + [(22/36) (4.5)] = 5.28 B)[(15/38) (6.5)] + [(23/38) (4.5)] = 5.29 C)[(15/23) (6.5)] + [(23/15) (4.5)] = 11.14 D)[(14/22) (6.5)] + [(22/14) (4.5)] = 11.21 4.)If the standard deviation of the distribution of the difference between means is 0.76. what is the t score? A)(15-23)/0.76 = -10.53 B)(0.76) (15-23) = -6.08 C)[(6.5 + 4.5)/2] [0.76] = 4.18 D)(55 - 51)/0.76 = 5.26

Explanation / Answer

1).

HM= 2*18*7/(18+7) =10.08

Answer B) 7

2).

Df=(n1-1)+(n2-1)

Answer : A: (15-1)+(23-1) =36

3).

Answer A).

(14*6.5)/36+(22*4.5)/36=5.28

4).

Answer D).

(55-51)/0.76 =5.26

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