Methods (Edexcel A-Level Psychology): Quizzes

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Correlational Research and Data
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What does correlational research identify?

Whether two variables are related

Which example shows a positive correlation?

More revision hours & higher test scores

What characterizes a negative correlation?

One variable increases, other decreases

Why can't correlations establish causality?

Can't tell which variable causes which

What is the third variable problem?

An unmeasured variable affects both

What range do correlation coefficients fall within?

+1 and -1

When is Spearman's rho test appropriate?

For correlations with ordinal data

What does p ≤ 0.05 indicate?

5% probability results are due to chance

For significance in Spearman's, the observed value must:

Equal or exceed the critical value

What is the main purpose of a scatter diagram?

Visually identify variable relationships

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