Seorang mahasiswa melakukan
penelitian dengan menggunakan kuesioner untuk mengetahui atau mengungkap minat belajar dan tes hasil belajar siswa. Kuesioner terdiri
dari 12 item yang menggunakan skala Likert :
1
= sangat
tidak
setuju,
2 = tidak setuju, 3 = setuju, 4 =
sangat
setuju.
Soal
tes hasil belajar terdiri dari 15 item berupa pilihan ganda: 1 = untuk jawaban
benar, 0 = untuk jawaban salah.
Setelah instrumen dilakukan uji
coba pada 20 responden diperoleh data berikut (slide berikutnya). Lakukanlah
pengujian validitas dan reliabilitas dari kedua instrumen tersebut!
Data mentah kuesioner
Resp.
|
Skor Item
|
|||||||||
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
1
|
1
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
2
|
1
|
3
|
1
|
3
|
4
|
3
|
3
|
3
|
3
|
3
|
3
|
4
|
3
|
2
|
1
|
1
|
3
|
3
|
4
|
3
|
3
|
4
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
4
|
5
|
3
|
3
|
2
|
3
|
1
|
2
|
3
|
1
|
3
|
3
|
6
|
4
|
3
|
2
|
3
|
4
|
2
|
1
|
4
|
3
|
2
|
7
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
8
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
9
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
4
|
10
|
4
|
3
|
2
|
3
|
4
|
1
|
4
|
3
|
3
|
3
|
11
|
4
|
3
|
2
|
4
|
4
|
2
|
3
|
4
|
3
|
3
|
12
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
Data mentah soal tes hasil belajar
Resp
|
No. Item
|
|||||||||
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
2
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
3
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
4
|
1
|
1
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
5
|
0
|
1
|
0
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
6
|
0
|
1
|
1
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
7
|
0
|
1
|
0
|
0
|
0
|
1
|
1
|
1
|
1
|
1
|
8
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
9
|
1
|
0
|
1
|
1
|
1
|
1
|
0
|
1
|
1
|
0
|
10
|
1
|
0
|
0
|
0
|
1
|
1
|
0
|
1
|
1
|
0
|
11
|
0
|
0
|
0
|
0
|
1
|
1
|
0
|
1
|
1
|
0
|
12
|
0
|
0
|
1
|
0
|
1
|
1
|
1
|
0
|
1
|
0
|
Uji Validitas Instrumen
(Butir Soal Politomi – Product Moment Pearson)
Resp.
|
Skor Item
|
Skor Total (Y)
|
Y2
|
|||||||||
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|||
1
|
1
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
28
|
784
|
2
|
1
|
3
|
1
|
3
|
4
|
3
|
3
|
3
|
3
|
3
|
27
|
729
|
3
|
4
|
3
|
2
|
1
|
1
|
3
|
3
|
4
|
3
|
3
|
27
|
729
|
4
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
4
|
32
|
1024
|
5
|
3
|
3
|
2
|
3
|
1
|
2
|
3
|
1
|
3
|
3
|
24
|
576
|
6
|
4
|
3
|
2
|
3
|
4
|
2
|
1
|
4
|
3
|
2
|
28
|
784
|
7
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
31
|
961
|
8
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
31
|
961
|
9
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
4
|
32
|
1024
|
10
|
4
|
3
|
2
|
3
|
4
|
1
|
4
|
3
|
3
|
3
|
30
|
900
|
11
|
4
|
3
|
2
|
4
|
4
|
2
|
3
|
4
|
3
|
3
|
32
|
1024
|
12
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
31
|
961
|
Jmlh
|
41
|
36
|
23
|
35
|
42
|
25
|
35
|
43
|
36
|
37
|
353
|
124609
|
X2
|
155
|
108
|
45
|
107
|
162
|
55
|
107
|
163
|
108
|
117
|
|
|
r
|
0.513
|
0
|
0.296
|
0.392
|
0.711
|
-0.371
|
0.180
|
0.709
|
0
|
0.451
|
|
2.880
|
Perhitungan untuk item nomor 1 dan 2
No
|
X
|
Y
|
X2
|
Y2
|
XY
|
1
|
1
|
28
|
1
|
784
|
28
|
2
|
1
|
27
|
1
|
729
|
27
|
3
|
4
|
27
|
16
|
729
|
108
|
4
|
4
|
32
|
16
|
1024
|
128
|
5
|
3
|
24
|
9
|
576
|
72
|
6
|
4
|
28
|
16
|
784
|
112
|
7
|
4
|
31
|
16
|
961
|
124
|
8
|
4
|
31
|
16
|
961
|
124
|
9
|
4
|
32
|
16
|
1024
|
128
|
10
|
4
|
30
|
16
|
900
|
120
|
11
|
4
|
32
|
16
|
1024
|
128
|
12
|
4
|
31
|
16
|
961
|
124
|
Jumlah
|
41
|
353
|
155
|
10457
|
1223
|
No
|
X
|
Y
|
X2
|
Y2
|
XY
|
1
|
3
|
28
|
9
|
784
|
84
|
2
|
3
|
27
|
9
|
729
|
81
|
3
|
3
|
27
|
9
|
729
|
81
|
4
|
3
|
32
|
9
|
1024
|
96
|
5
|
3
|
24
|
9
|
576
|
72
|
6
|
3
|
28
|
9
|
784
|
84
|
7
|
3
|
31
|
9
|
961
|
93
|
8
|
3
|
31
|
9
|
961
|
93
|
9
|
3
|
32
|
9
|
1024
|
96
|
10
|
3
|
30
|
9
|
900
|
90
|
11
|
3
|
32
|
9
|
1024
|
96
|
12
|
3
|
31
|
9
|
961
|
93
|
Jumlah
|
36
|
353
|
108
|
10457
|
1059
|
r = (12 x 1223) – ( 41 x 353) r
= (12 x 1059) – ( 36 x 353)
√ {(12 x 155)-412}{(12 x 10457)-3532} √ {(12 x 108) -362}{(12 x
10457)-3532}
·
Diperoleh
korelasi bivariat Pearson antara skor item dengan skor total untuk
masing-masing item. Jika digunakan level of significance dengan uji 2 sisi dan n=12 maka titik kritisnya adalah 0.576.
·
Terlihat
bahwa item 1, 2, 3, 4, 6, 7, 9, dan 10 kurang dari 0.576. Sehingga dapat
disimpulkan bahwa item 1, 2, 3, 4, 6, 7, 9, dan 10 tidak valid (invalid) dan
jika perlu item tersebut diubah atau dibuang (asalkan tidak mengurangi arti
kuesioner secara kesatuan).
Uji Validitas
Instrumen (Butir Soal Dikotomi – Point Biserial)
Resp
|
No. Item
|
Skor Total
|
|||||||||
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
||
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
9
|
2
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
9
|
3
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
8
|
4
|
1
|
1
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
9
|
5
|
0
|
1
|
0
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
7
|
6
|
0
|
1
|
1
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
8
|
7
|
0
|
1
|
0
|
0
|
0
|
1
|
1
|
1
|
1
|
1
|
6
|
8
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
9
|
9
|
1
|
0
|
1
|
1
|
1
|
1
|
0
|
1
|
1
|
0
|
7
|
10
|
1
|
0
|
0
|
0
|
1
|
1
|
0
|
1
|
1
|
0
|
5
|
11
|
0
|
0
|
0
|
0
|
1
|
1
|
0
|
1
|
1
|
0
|
4
|
12
|
0
|
0
|
1
|
0
|
1
|
1
|
1
|
0
|
1
|
0
|
5
|
Jumlah
|
6
|
8
|
7
|
6
|
11
|
12
|
9
|
11
|
12
|
4
|
86
|
Xi
|
8
|
8.125
|
7.857
|
8.5
|
7.273
|
7.167
|
7.778
|
7.364
|
7.167
|
7.5
|
|
Xt
|
7.167
|
7.167
|
7.167
|
7.167
|
7.167
|
7.167
|
7.167
|
7.167
|
7.167
|
7.167
|
|
St
|
1.724
|
1.724
|
1.724
|
1.724
|
1.724
|
1.724
|
1.724
|
1.724
|
1.724
|
1.724
|
|
Pi
|
0.5
|
0.667
|
0.583
|
0.5
|
0.917
|
1
|
0.75
|
0.917
|
1
|
0.333
|
|
Qi
|
0.5
|
0.333
|
0.417
|
0.5
|
0.083
|
0
|
0.25
|
0.083
|
0
|
0.667
|
r tabel
|
Rbis
|
0.483
|
0.786
|
0.474
|
0.773
|
0.204
|
0
|
0.614
|
0.379
|
0.000
|
0.137
|
0.576
|
Perhitungan untuk item nomor 1 dan 2
No
|
X
|
Y
|
Y2
|
XY
|
1
|
1
|
9
|
81
|
9
|
2
|
1
|
9
|
81
|
9
|
3
|
0
|
8
|
64
|
0
|
4
|
1
|
9
|
81
|
9
|
5
|
0
|
7
|
49
|
0
|
6
|
0
|
8
|
64
|
0
|
7
|
0
|
6
|
36
|
0
|
8
|
1
|
9
|
81
|
9
|
9
|
1
|
7
|
49
|
7
|
10
|
1
|
5
|
25
|
5
|
11
|
0
|
4
|
16
|
0
|
12
|
0
|
5
|
25
|
0
|
Jumlah
|
6
|
86
|
652
|
48
|
No
|
X
|
Y
|
Y2
|
XY
|
1
|
1
|
9
|
81
|
9
|
2
|
1
|
9
|
81
|
9
|
3
|
1
|
8
|
64
|
8
|
4
|
1
|
9
|
81
|
9
|
5
|
1
|
7
|
49
|
7
|
6
|
1
|
8
|
64
|
8
|
7
|
1
|
6
|
36
|
6
|
8
|
1
|
9
|
81
|
9
|
9
|
0
|
7
|
49
|
0
|
10
|
0
|
5
|
25
|
0
|
11
|
0
|
4
|
16
|
0
|
12
|
0
|
5
|
25
|
0
|
Jumlah
|
8
|
86
|
652
|
65
|
Xi = / = 48/6 = 8 Xi = 8.125
Xt = / n = 86/12 = 7.167 Xt = 7.167
St = = 1.724 St = 1.724
Pi = 6/12 = 0.5 pi = 0.667
Qi = 1- 0.5 = 0.5 qi = 0.333
Rbis = ((8 – 7.167)/1.724)X(= 0.483 rbis = 0.786
Perhitungan Nilai
Reliabilitas Instrumen
Spearman-Brown (Split Half) – Data genap
Resp
|
Skor Item Ganjil (i)
|
Skor Total
|
Resp
|
Skor Item Genap (j)
|
Skor Total
|
|||||||||||
1
|
3
|
5
|
7
|
9
|
11
|
2
|
4
|
6
|
8
|
10
|
12
|
|||||
1
|
1
|
2
|
4
|
3
|
3
|
3
|
16
|
1
|
3
|
3
|
2
|
4
|
3
|
2
|
17
|
|
2
|
1
|
1
|
4
|
3
|
3
|
3
|
15
|
2
|
3
|
3
|
3
|
3
|
3
|
3
|
18
|
|
3
|
4
|
2
|
1
|
3
|
3
|
3
|
16
|
3
|
3
|
1
|
3
|
4
|
3
|
3
|
17
|
|
4
|
4
|
2
|
4
|
3
|
3
|
3
|
19
|
4
|
3
|
3
|
2
|
4
|
4
|
3
|
19
|
|
5
|
3
|
2
|
1
|
3
|
3
|
3
|
15
|
5
|
3
|
3
|
2
|
1
|
3
|
3
|
15
|
|
6
|
4
|
2
|
4
|
1
|
3
|
2
|
16
|
6
|
3
|
3
|
2
|
4
|
2
|
3
|
17
|
|
7
|
4
|
2
|
4
|
3
|
3
|
3
|
19
|
7
|
3
|
3
|
2
|
4
|
3
|
3
|
18
|
|
8
|
4
|
2
|
4
|
3
|
3
|
3
|
19
|
8
|
3
|
3
|
2
|
4
|
3
|
3
|
18
|
|
9
|
4
|
2
|
4
|
3
|
3
|
3
|
19
|
9
|
3
|
3
|
2
|
4
|
4
|
3
|
19
|
|
10
|
4
|
2
|
4
|
4
|
3
|
3
|
20
|
10
|
3
|
3
|
1
|
3
|
3
|
3
|
16
|
|
11
|
4
|
2
|
4
|
3
|
3
|
4
|
20
|
11
|
3
|
4
|
2
|
4
|
3
|
3
|
19
|
|
12
|
4
|
2
|
4
|
3
|
3
|
3
|
19
|
12
|
3
|
3
|
2
|
4
|
3
|
3
|
18
|
|
Jumlah
|
41
|
23
|
42
|
35
|
36
|
36
|
213
|
Jumlah
|
36
|
35
|
25
|
43
|
37
|
35
|
211
|
Perhitungan korelasi gabungan (rb) nomor ganjil genap
Resp
|
i
|
j
|
ij
|
i2
|
j2
|
1
|
16
|
17
|
272
|
256
|
289
|
2
|
15
|
18
|
270
|
225
|
324
|
3
|
16
|
17
|
272
|
256
|
289
|
4
|
19
|
19
|
361
|
361
|
361
|
5
|
15
|
15
|
225
|
225
|
225
|
6
|
16
|
17
|
272
|
256
|
289
|
7
|
19
|
18
|
342
|
361
|
324
|
8
|
19
|
18
|
342
|
361
|
324
|
9
|
19
|
19
|
361
|
361
|
361
|
10
|
20
|
16
|
320
|
400
|
256
|
11
|
20
|
19
|
380
|
400
|
361
|
12
|
19
|
18
|
342
|
361
|
324
|
Jumlah
|
213
|
211
|
3759
|
3823
|
3727
|
rb =
|
165 =
|
0.51432
|
320.813
|
Dengan rumus Product moment diperoleh nilai 0.514 kemudian
disubstitusikan ke dalam rumus Spearman-Brown.
ri =
|
2rb =
|
0.67927
|
1+rb
|
Maka nilai reliabilitasnya adalah 0.679.
Alfa Cronbach – data politomi
Resp.
|
Skor Item
|
Skor Total
|
Kuadrat Skor
|
|||||||||
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|||
1
|
1
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
28
|
784
|
2
|
1
|
3
|
1
|
3
|
4
|
3
|
3
|
3
|
3
|
3
|
27
|
729
|
3
|
4
|
3
|
2
|
1
|
1
|
3
|
3
|
4
|
3
|
3
|
27
|
729
|
4
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
4
|
32
|
1024
|
5
|
3
|
3
|
2
|
3
|
1
|
2
|
3
|
1
|
3
|
3
|
24
|
576
|
6
|
4
|
3
|
2
|
3
|
4
|
2
|
1
|
4
|
3
|
2
|
28
|
784
|
7
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
31
|
961
|
8
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
31
|
961
|
9
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
4
|
32
|
1024
|
10
|
4
|
3
|
2
|
3
|
4
|
1
|
4
|
3
|
3
|
3
|
30
|
900
|
11
|
4
|
3
|
2
|
4
|
4
|
2
|
3
|
4
|
3
|
3
|
32
|
1024
|
12
|
4
|
3
|
2
|
3
|
4
|
2
|
3
|
4
|
3
|
3
|
31
|
961
|
Jumlah
|
41
|
36
|
23
|
35
|
42
|
25
|
35
|
43
|
36
|
37
|
353
|
10457
|
X2
|
155
|
108
|
45
|
107
|
162
|
55
|
107
|
163
|
108
|
117
|
|
|
Varian
|
1.243
|
0
|
0.076
|
0.410
|
1.250
|
0.243
|
0.410
|
0.743
|
0
|
0.243
|
|
4.618
|
Menghitung
varian total
|
||
X2
=
|
72.9
|
|
St2
=
|
6.08
|
|
Nilai
reliabilitas
|
||
ri =
|
0.26
|
KR-20/Kuder-Richardson – Dikotomi
Resp.
|
Skor Item
|
Xt
|
Xt2
|
||||||||||||||
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
||||||||
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
9
|
81
|
|||||
2
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
9
|
81
|
|||||
3
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
8
|
64
|
|||||
4
|
1
|
1
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
9
|
81
|
|||||
5
|
0
|
1
|
0
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
7
|
49
|
|||||
6
|
0
|
1
|
1
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
8
|
64
|
|||||
7
|
0
|
1
|
0
|
0
|
0
|
1
|
1
|
1
|
1
|
1
|
6
|
36
|
|||||
8
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
9
|
81
|
|||||
9
|
1
|
0
|
1
|
1
|
1
|
1
|
0
|
1
|
1
|
0
|
7
|
49
|
|||||
10
|
1
|
0
|
0
|
0
|
1
|
1
|
0
|
1
|
1
|
0
|
5
|
25
|
|||||
11
|
0
|
0
|
0
|
0
|
1
|
1
|
0
|
1
|
1
|
0
|
4
|
16
|
|||||
12
|
0
|
0
|
1
|
0
|
1
|
1
|
1
|
0
|
1
|
0
|
5
|
25
|
|||||
Np
|
6
|
8
|
7
|
6
|
11
|
12
|
9
|
11
|
12
|
4
|
86
|
652
|
|||||
P
|
0.5
|
0.667
|
0.583
|
0.5
|
0.917
|
1
|
0.75
|
0.917
|
1
|
0.333
|
|
|
|||||
Q
|
0.5
|
0.333
|
0.417
|
0.5
|
0.083
|
0
|
0.25
|
0.083
|
0
|
0.667
|
|
|
|||||
Pq
|
0.25
|
0.222
|
0.243
|
0.25
|
0.076
|
0
|
0.188
|
0.076
|
0
|
0.222
|
|
1.528
|
|||||
Varians
total
|
|||||||||||||||||
X2=
|
35.67
|
||||||||||||||||
St2 =
|
X2 =
|
2.9722
|
|||||||||||||||
12
|
|||||||||||||||||
Nilai
reliabilitas
|
|||||
ri =
|
1.111 X
|
0.486 =
|
0.54
|
||
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