Ida Lee and his team collect a lot of analysis of statistical data about the car market .According to the data, they come to the conclusion that the mean price of SUV is more than $46,435 in his country. Then they randomly select 64 SUVs whose mean price is $46,760. Assuming the standard deviation of the sample is 1370. Ida Lee conducts a hypothesis test to check their conclusion. At which significant level should Ida Lee reject the null hypothesis?
B is correct.
If the significant level is 5%, the critical value=1.669<1.8978, Ida Lee should reject the null.
If the significant level is 0.5%, the critical value=2.656>1.8978, Ida Lee will fail to reject the null.
If the significant level is 1%, the critical value=2.387>1.8978, Ida Lee will fail to reject the null.
请问这里的 5%的critical value 为什么是1.669 呢？ 有点不太懂这个
