General Motors recently announced that they plan to make exclusively electric cars by 2035. Suppose this is based in part on focus groups which indicated that approximately 60% of Americans would be willing to spend at least $5000 extra up front on an electric car if they would save that money on gas within several years. A survey firm decides to test this claim with a national survey of 600 randomly selected people. Define your parameter and the null and alternative hypothesis. Suppose their survey finds 337 people who are willing to spend at least $5,000 more on an electric vehicle. Calculate the sample proportion and determine if this provides convincing evidence that GM's claim is inaccurate