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VICSpecialist MathematicsQuick questions

Unit 4: Data analysis, probability and statistics

Quick questions on Confidence intervals for a mean: VCE Specialist Mathematics Unit 4

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is zz value?
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For 95%95\% confidence, z=1.96z = 1.96.
What is wrong zz value?
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Match the zz to the level: 1.961.96 for 95%95\%, not for 90%90\% or 99%99\%.
What is q1?
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State the zz value for a 99%99\% confidence interval. [1 mark]
What is q2?
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Find the margin of error for σ=15\sigma = 15, n=25n = 25, at 95%95\% confidence. [2 marks]
What is q3?
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Give the correct interpretation of a 95%95\% confidence interval. [2 marks]

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