Page 147 - Evaluasi Pembelajaran

275 – (87) /30
2
s 5 = --------------------------- = 0,76
2
30

388 – (104) /30
2
s 6 = --------------------------- = 0,92
2
30

Dengan demikian, koefisien reliabilitas alpha Cronbach
(rα) adalah:

k ((s y – (s 1 + s 2 + … + s k))
2
2
2
2
rα = ------------------------------------------
(k-1) s y
2

6 ((11,26 – (0,54+0,89+0,71+1,09+0,76+0,92))
rα = ------------------------------------------------------------
(6-1) (11,26)

6 ((11,26 – (4,91))
rα = -------------------------
5(11,26)

6 (6,35)
rα = ------------
56,30

38,10
rα = -----------

56,30

rα = 0,68

136