Population and Sample RESEARCH METHODOLOGY

Day-3 a. Students gathered with their group b. Teacher makes a quiz about noun and adjective that students have learned, while a representative of each group are trained to read the third picture storybook. c. Teacher introduces the third picture storybook to experiment group. Teacher reads the title, the writers and the publisher. d. Teacher shows the cover and asks students to make a simple prediction about the story that will be read by their representative of each group. e. Teacher asks the representative of each group to read the third picture storybook with the tittle “Red Cherries in a Jar” 6 for their group. f. Students utter a moral value of the story. g. Teacher gives clues about the total of noun and adjective of each page. For groups who are answer those vocabularies correctly, they get score. Day-4 a. Students gather with their group b. Teacher makes a “mystery box” game. There are some pictures related to the fourth picture storybook, while another representative of each group are trained to read the fourth picture storybook. c. Teacher introduces the fourth picture storybook with the tittle “While We Were Weak ” 7 to experiment group. Teacher reads the title, the writers and the publisher. d. Teacher shows the cover and asks students to make a simple prediction about the story that will be read by their representative of each group. e. A representative of each group read the fourth picture storybook to their groups. f. Students utter moral value of the story. g. Teacher asks students to tell about noun and adjectives directly in the fourth picture storybook. Every group have two chances to tell vocabularies. 6 Erna Fitrini and Ratih Sumiratingratri, Always English, Bekasi: Cahaya Pustaka Raga, 2009, pp. 13-23. 7 Ibid., pp. 25-33.

F. Technique of Analyzing Data

To find out the effectiveness of picture storybook on students’ vocabulary mastery at the seventh grade of SMP Kartika VII-1 Cijantung, the writer uses T-test. The writer uses the formula that is independent sample T-test. Because the sample that the writer use is independent sample, and they are in small sample size. 8 t o = t o : t value M 1 : Mean of experimental group gained score M 2 : Mean of controlled group gained score SE M : Standard Error of experimental class SE M : Standard Error of controlled class The procedure of calculation as follows 9 : a. Determining Mean I with formula: Mean Variable X M 1 = b. Determining Mean II with formula: Mean Variable Y M 2 = c. Determining of Standard Deviation of Variable X : SD 1 = 8 Anas Sudijono, Pengantar Statistik Pendidikan, Jakarta: PT Rajagrafindo Persada, 2014, pp. 314-316. 9 Ibid.

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