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2 Statistics

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Question 206

Under H0H_0H0​, X∼B(20,0.5)X\sim B(20,0.5)X∼B(20,0.5). A two-tailed test observes X=4X=4X=4.

a.

Explain why the lower-tail probability is doubled for this symmetric null model.

[1]
b.

Calculate the exact two-tailed p-value.

[3]
c.

State the decision at the 5% level.

[2]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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