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

4short 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 wrong

z

value?

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Match the

z

to the level:

1.96

for

95\%

, not for

90\%

99\%

What is q1?

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State the

z

value for a

99\%

confidence interval. [1 mark]

What is q2?

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Find the margin of error for

\sigma = 15

n = 25

, at

95\%

confidence. [2 marks]

What is q3?

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Give the correct interpretation of a

95\%

confidence interval. [2 marks]

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