哈克特說，這種自願式調查容易受到「虛假受訪者」影響，使數據失真：「而且這不是隨機的。失真往往在年輕族群中最高。」
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American singer-songwriter Neil Sedaka, who wrote and performed hits through the 1950s and 60s, including Oh! Carol, Breaking Up Is Hard To Do, Bad Blood, Laughter in the Rain and Calendar Girl, has died at the age of 86.