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10 Key Concepts in Hypothesis Testing

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.

BBC - GCSE Bitesize: The lock and key mechanism

The Red Queen hypothesis for sex is simple: Sex is needed to fight disease. Diseases specialize in breaking into cells, either to eat them, as fungi and bacteria do, or, like viruses, to subvert their genetic machinery for the purpose of making new viruses. To do that they use protein molecules that bind to other molecules on cell surfaces. The arms races between and their hosts are all about these binding proteins. Parasites invent new keys; hosts change the locks. For if one lock is common in one generation, the key that fits it will spread like wildfire. So you can be sure that it is the very lock not to have a few generations later. According to the Red Queen hypothesis, sexual reproduction persists because it enables host species to evolve new genetic defenses against parasites that attempt to live off them.

2 2 Lock and key hypothesis - YouTube

The Key to the Riemann Hypothesis - Numberphile - …

The Input hypothesis is Krashen's attempt to explain how the learner acquires a second language – how second language acquisition takes place. The Input hypothesis is only concerned with 'acquisition', not 'learning'. According to this hypothesis, the learner improves and progresses along the 'natural order' when he/she receives second language 'input' that is one step beyond his/her current stage of linguistic competence. For example, if a learner is at a stage 'i', then acquisition takes place when he/she is exposed to 'Comprehensible Input' that belongs to level 'i + 1'. Since not all of the learners can be at the same level of linguistic competence at the same time, Krashen suggests that natural communicative input is the key to designing a syllabus, ensuring in this way that each learner will receive some 'i + 1' input that is appropriate for his/her current stage of linguistic competence.

Enzymes are specific. Only molecules with the correct shape can fit into the enzyme. Just like only one key can open a lock, only one type of enzyme can speed up a specific reaction. This is called the lock and key model.

Hypothesis Generation: A Key Data Science Challenge | …

17/02/2017 · Hypothesis Generation: A Key Data Science Challenge

A dichotomous key to potential bat-roosts in trees for use in the formation of a hypothesis used to guide further survey effort, and also an interpretive tool to give a hypothesis of what might have been present, where conclusive evidence has eluded survey.

At scales larger than humanity, we can find immunity candidates in the unreasonably life-friendly nature of the universe as a system (Davies 2004), and in Earth’s geophysical systems, as characterized in the Gaia hypothesis (Lovelock and Margulis 1974).

The Lock-and-Key Hypothesis: Evolutionary and Biosystematic Interpretation of Insect Genitalia
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Difference between Lock and Key hypothesis and …

For categorical data shown on a contingency table, the null hypothesis is that any differences between the observed frequencies (counts in categories) and expected frequencies are due to chance.

Research Hypothesis (H) The (or hypotheses -- there may be more than one) is our working hypothesis -- our prediction, or what we expect to happen.

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