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What is a stratified sample?

Stratified sampling is a technique used in some instances to generate a 'fairer' sample than standard random sampling. Wherein a population is divided into subgroups called 'strata'. These strata are usually...
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Answered by Lewis S. • Maths tutor
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Discuss 'deviation from ideal mental health' as a definition of abnormality. (8 marks)

This definition identifies the characteristics required for good mental health, and suggests that the further an individual is from this ideal, the more likely they are to be classified as abnormal. Jahoda i...
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Answered by Betsy E. • Psychology tutor
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Find the speed of a wave.

To solve that we get given that a wave generator produces three waves per second at a wavelenght of 1.2 meters. To tackle this you can use the formula v= f * lambda (speed = frequency * wavelength) In prepar...
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Answered by Max P. • Physics tutor
2876 Views

How does the potential travel between synapses?

The potential or information travels between a pre-synaptic and a post-synaptic neuron. As a reminder, for information, we intend the flow of Na+ and K+ ions between two locations. When the potential arrives...
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Answered by Filippo A. • Biology tutor
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What is the enthalpy of atomisation?

The enthalpy of atomisation is the enthalpy change when 1 mole of gaseous atoms is formed from its constituent element, in standard conditions.
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Answered by Eugeni R. • Chemistry tutor
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