For paired t, the hypotheses are as follows.
 Null hypothesis

H_{0}: μ_{d} = μ_{0} 
The population mean of the differences (μ_{d}) equals the hypothesized mean of the differences (μ_{0}). 
 Alternative hypothesis
 Select one of the following alternative hypotheses.
H_{1}: μ_{d} ≠ μ_{0} 
The population mean of the differences (μ_{d}) does not equal the hypothesized mean of the differences (μ_{0}). 
H_{1}: μ_{d} > μ_{0} 
The population mean of the differences (μ_{d}) is greater than the hypothesized mean of the differences (μ_{0}). 
H_{1}: μ_{d} < μ_{0} 
The population mean of the differences (μ_{d}) is less than the hypothesized mean of the differences (μ_{0}). 