Hypothesis is singular, while Hypotheses is the plural of Hypothesis.
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In statistics the null hypothesis is usually the one that asserts that the data come from some defined distribution. The alternative hypotheses may simply be that they do not, or it may be that they come from some other, defined distribution.
The difference is that working hypothesis is that your still working on it but the hypothesis that your not working on it.
A hypothesis is tested by investigation through experimentation
A scientific hypothesis has to be testable.
5. The manufacturer of a spot remover claims that his product removes 90 percent of all spots. In a random sample, the spot remover removes 11 of 16 stains. Write the null and alternative hypotheses.