Binomial test for a single proportion  overview
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Binomial test for a single proportion 


Independent variable  
None  
Dependent variable  
One categorical with 2 independent groups  
Null hypothesis  
H_{0}: $\pi = \pi_0$
$\pi$ is the population proportion of 'successes'; $\pi_0$ is the population proportion of successes according to the null hypothesis  
Alternative hypothesis  
H_{1} two sided: $\pi \neq \pi_0$ H_{1} right sided: $\pi > \pi_0$ H_{1} left sided: $\pi < \pi_0$  
Assumptions  
 
Test statistic  
$X$ = number of successes in the sample  
Sampling distribution of $X$ if H0 were true  
Binomial($n$, $p$) distribution
Here $n = N$ (total sample size), and $p = \pi_0$ (population proportion according to the null hypothesis)  
Significant?  
Two sided:
 
Example context  
Is the proportion of smokers amongst office workers different from $\pi_0 = .2$?  
SPSS  
Analyze > Nonparametric Tests > Legacy Dialogs > Binomial...
 
Jamovi  
Frequencies > 2 Outcomes  Binomial test
 
Practice questions  