hypothesis testing in time series analysis

例句：

1. 1. In time series analysis, hypothesis testing is essential for understanding the underlying trends and patterns in data.
   在时间序列分析中，假设检验是理解数据背后趋势和模式的关键。
2. 2. The researcher conducted a hypothesis testing to determine if there was a significant difference between the two groups.
   研究者进行了假设检验，以确定两组之间是否存在显著差异。
3. 3. The hypothesis testing revealed that the population growth rate was not significantly different from the previousyear.
   假设检验显示，人口增长率与前一年没有显著差异。