Kelantan: State government survey finds 90% in Kelantan want hudud... but are you convinced?

- See more at: http://www.themalaysianinsider.com/malaysia/article/state-government-survey-finds-90-in-kelantan-want-hudud#sthash.ygxOvtRd.dpuf

Meanwhile political scientist, Dr Wong Chin Huat explains succinctly the fallacy of such a claim:

'How does Kelantan state government find 90% of support for its Syariah Criminal Code? Here is a simple methodological analysis.

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Teacher: Raise your hand if you are absent.
Teacher: Great, 100% attendance!

Statistician: 100% self-selection bias.

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PAS Kelantan: Reply to our sms whether you agree with Syariah Criminal Code
156,138 surveyed.
9,654 responded. (response rate: 6.18%)
8,940 accepted. ("acceptance rate": 92.60%)
8,198 support. (support rate: 91.70%) 
PAS Kelantan: yeah, 91.70% support Hudud!

Hold on, here are more details:

Question 1:
"After 20 years the Shariah Criminal Code (hudud) is going to become a reality. Agree/Disagree?" Surveyed: 77,382
Responded: 5,395
Accepted: 5,284

Question 2:
"To ensure that the Shariah Criminal Code (hudud) is implemented, it is necessary to work with the federal government. Agree/Disagree?"
Surveyed: 78,756
Responded: 4,259
Accepted: 3,656

Here is the arithmetic: 
5,395+4,259 = 9,654
5,284+3,656 = 8,940

So
1. Can respondents from two different surveys be added together to produce a single percentage?
2. Why is there not a question asking "Do you support the Syariah Criminal Code?"
3. Why are 111 questions to Question 1 and 603 responses to Question 2 "unaccepted"? May we have some samples of the rejected responses?'

-KoSong