题目：
"To reverse a decline in listener numbers， our owners have decided that WWAC must change from its current rock-music format. The decline has occurred despite population growth in our listening area， but that growth has resulted mainly from people moving here after their retirement. We must make listeners of these new residents. We could switch to a music format tailored to their tastes， but a continuing decline in local sales of recorded music suggests limited interest in music. Instead we should change to a news and talk format， a form of radio that is increasingly popular in our area."
Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would weaken or strengthen the argument.
中文翻译：
为了扭转观众流失的局面，WWAC的老板们决定必须要摒弃目前的摇滚乐风格。尽管我们广播区域内人口增加，收听人数依然下降。但增加的人口主要是一些退休后移居本地的。我们必须要抓住这些新的听众，我们可以转变音乐风格来迎合他们，但最近本地音乐销量的持续走低表明他们对音乐没什么兴趣。所以，我们可以变为新闻谈话类的形式来提升我们电台在本地的人气。
写一篇回应，讨论还需要何种具体的证据才能更好的评估上面的论证，并解释这个证据是如何强化/削弱这篇文章的论证的。
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