scipy.stats.binom_test¶

scipy.stats.
binom_test
(x, n=None, p=0.5, alternative='twosided')[source]¶ Perform a test that the probability of success is p.
This is an exact, twosided test of the null hypothesis that the probability of success in a Bernoulli experiment is p.
 Parameters
 xinteger or array_like
the number of successes, or if x has length 2, it is the number of successes and the number of failures.
 ninteger
the number of trials. This is ignored if x gives both the number of successes and failures
 pfloat, optional
The hypothesized probability of success. 0 <= p <= 1. The default value is p = 0.5
 alternative{‘twosided’, ‘greater’, ‘less’}, optional
Indicates the alternative hypothesis. The default value is ‘twosided’.
 Returns
 pvaluefloat
The pvalue of the hypothesis test
References
Examples
>>> from scipy import stats
A car manufacturer claims that no more than 10% of their cars are unsafe. 15 cars are inspected for safety, 3 were found to be unsafe. Test the manufacturer’s claim:
>>> stats.binom_test(3, n=15, p=0.1, alternative='greater') 0.18406106910639114
The null hypothesis cannot be rejected at the 5% level of significance because the returned pvalue is greater than the critical value of 5%.