Theories apply to a broader range of phenomena than do hypotheses.

Krashen's theory of second language acquisition consists of five main hypotheses:

Hypothesis and options are used in the description of beliefs.

One such idea is the aquatic ape hypothesis (AAH) which attempts to explain a number of human adaptations with the single explanation of a semi-aquatic ancestor.

This is just a brief example of scientific method.

One can never prove the truth of a statistical (null) hypothesis.

Documentary Hypothesis, or JEDP Theory, is the view held by various scholars that the five books of the Pentateuch were really written by four different authors, and not Moses.

the probability of rejecting the null hypothesis when the null hypothesis is true.

Krashen's research has led many schools to implement in-class reading programmes such as SSR (Sustained Silent Reading). Investigations conducted by the US National Reading Panel (2000) did not find clear evidence that these programmes made students better readers or encouraged them to read more. Some educators (see Klump, 2007) believe that SSR is not the most productive use of instructional time. Krashen's response is that the NRP's research was flawed and that SSR does indeed result in better readers and more reading.

What is the calculated value suitable for testing the above hypothesis?

The Language of Hypothesis Testing - dummies

It is claimed that the natural order of acquisition is very similar for a native-English child learning its own language and for an adult learning English as a foreign language. For example, the-ing form (present continuous) will be acquired early on and almost certainly before the -s inflection in the third person present simple (, etc.) As Krashen points out, much of the frustration experienced by teachers and their students in grammar lessons results from the attempt to inculcate a grammatical form which the learner is not yet ready to acquire.

The over-pruning hypothesis of autism - ResearchGate

For example, a particular hypothesis about meteorological interactions or nuclear reactions might be so complex that it is best described in the form of a computer program or a long mathematical equation.

the Reading Hypothesis; How do Krashen's Hypotheses ..

Learners with a low affective filter will not only be efficient language acquirers of the comprehensible input they receive. They are also more likely to interact with others, unembarrassed by making mistakes for example, and thus increase the amount of that input.

Teaching the Hypothesis – Mr. Dr. Science Teacher

The two-Gospel hypothesis provides an effective response regarding these literary and historical similarities with the Gospels of Matthew, Mark, and Luke through a balanced approach utilizing both internal and external resources to address the long standing debate regarding the synoptic problem....

grounds spills over into the higher levels of education, ..

Finally, the fifth hypothesis, the Affective Filter hypothesis, embodies Krashen's view that a number of 'affective variables' play a facilitative, but non-causal, role in second language acquisition. These variables include: motivation, self-confidence and anxiety. Krashen claims that learners with high motivation, self-confidence, a good self-image, and a low level of anxiety are better equipped for success in second language acquisition. Low motivation, low self-esteem, and debilitating anxiety can combine to 'raise' the affective filter and form a 'mental block' that prevents comprehensible input from being used for acquisition. In other words, when the filter is 'up' it impedes language acquisition. On the other hand, positive affect is necessary, but not sufficient on its own, for acquisition to take place.