The two-sample t-test is a statistical hypothesis test used to determine whether an unknown population mean is different from a specific value.

Here is an example: 我们想知道601班的平均身高是否是170cm。

适用条件

  • Independent (values are not related to one another).
  • Continuous.
  • Obtained via a simple random sample from the population.

示例代码

MATLAB

公式：ttest2

比较x的均值是否等于75

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h = ttest(x,75)

比较x的均值是否大于等于75（小于等于75）

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[h,p] = ttest(x,75,"Tail","right") % H1: mean of x is greater than 75
[h,p] = ttest(x,75,"Tail","left") % H1: mean of x is smaller than 75

h为是否拒绝原假设

  • If h = 1, this indicates the rejection of the null hypothesis at the Alpha significance level.

  • If h = 0, this indicates a failure to reject the null hypothesis at the Alpha significance level.

p为p-value

R

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dfd

Python

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