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Please explain the three types of data you will need to know for A-Level Psychology. Give examples of each.

Nominal data is data that is categorised. For example, what pet do you have: Dog, cat, otherOrdinal data is data that can be put in order. For example, Jim scored 35 on a test and Joe scored 16 so Jim is bet...
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Answered by Maya B. • Psychology tutor
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Integrate the function xsin(4x^2) with respect to x, using the integration by substitution method.

Heres our integral: int(xsin(4x 2 )dx)The first decision to make is what to use as our substitution. We're going to go for the term tied up in the sine function: 4x 2 Set u = 4x 2 du/dx = 8x, therefore dx = ...
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Answered by Benjamin C. • Maths tutor
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A kettle has a 55% energy efficiency. The input energy for the kettle is 378,000 J per boil. Calculate the amount of energy dissipated in 5 boils.

Energy used for one boil = (3.78 x 10 5 / 100) x 55Energy used for one boil = 2.079 x 10 5 J Energy lost per boil = 3.78 x 10 5 -2.079 x 10 5 Energy lost per boil = 1.701 x 10 5 Energy lost per 5 boils = (1....
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Answered by Ryan A. • Physics tutor
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Explain what is meant by the term placebo, and how a placebo would be utilised in a clinical trial of a novel pain relief medication

A placebo is a control method to account for perceived effects of taking a medication. This is because patients often report that they feel a difference from taking a medication, irrespective of whether it h...
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Answered by Ryan A. • Biology tutor
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Find the 1st derivative of y = x^2 + 7x +3 and hence find the curves minima.

Firstly, we differentiate y = x 2 +7x+3 . This gives dy/dx = 2x+7.The minimum value occurs when dy/dx = 0. So find x and y when dy/dx=0. 2x+7=0 implies x= -3.5, which from the first equation means y = (-3.5)...
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Answered by Connor W. • Maths tutor
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