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# Urgent s2 help! watch

1. Chapter 7 - Hypothesis.

Someone please explain to me why the probability is 0.5????
isnt it 4/5???
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2. ANYONE? plsssssss
3. (Original post by hajs)
Chapter 7 - Hypothesis.

Someone please explain to me why the probability is 0.5????
isnt it 4/5???
H0: p=0.5 there is no preference between margarine and butter (equally preferred)
H1: p>0.5 there is preference for margarine

Let X be the number of people in a sample of 5 who prefer margarine
Binomial model X ~B(5,0.5)

P(X>=4) = ...

I can see why this question is confusing.
4. (Original post by TeeEm)
H0: p=0.5 there is no preference between margarine and butter (equally preferred)
H1: p>0.5 there is preference for margarine

Let X be the number of people in a sample of 5 who prefer margarine
Binomial model X ~B(5,0.5)

P(X>=4) = ...

I can see why this question is confusing.
Yeah thank you, but how would you know this, because all binomial has two outcomes, so it cant always be 0.5?
5. *BUMP*
6. (Original post by hajs)
Yeah thank you, but how would you know this, because all binomial has two outcomes, so it cant always be 0.5?
look at post 3 again the bits in bold and in colour

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