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1) For students of statistics: Please try the problem on your own first, and tell us what you have done so far. The more information we have, the better we can help you. Please don't expect quick solutions to your homework. We'll help you get started, exchange ideas, how-to's, etc. but only if you show that you are willing to learn and put in effort as well.

further hint: this is the observed distribution of the ten drinkers with the fake coffee..... (I'm one of the eight....I'm italian!). for you help I marked also all the significant level on each istogram bar....it will be very easy for you now to understand in which region you are: Acceptance or Rejection

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anyway....the test you are asked to do looks like the "sign test", which is a "binomial test".

As to the original question, I'd suggest to read this here first.

With kind regards

Karabiner

Hi @Karabiner: can you please explain which is the error in my brainstorming? Isn't it the same prolem as the following?

If the number of tossing was grater you can use other tests, i.e. chi-squared, but with only 10 tosses I think that a non parametric approach with the binomial test is correct.

Going back to the original question, as you can see, I already warned the OP first.

best regards

tossing a coin 10 times you get 8 heads. Is it a fair coin or not?

Going back to the original question, as you can see, I already warned the OP first.

best regards

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scaled outcome, not a binary outcome; and it is a test for 2 dependent samples,

but here we have 2 independent samples. But maybe I misunderstood your statement.

Likewise, the binomial test is not the solution here, in my opinion, as long as we assume

that the "natural brand" condition was not introduced just to lead the problem solvers

astray.

With kind regards

Karabiner

the way to approach the problem are more than one (for example I'd like to attack it in a Bayesian way).

But I think that the most natural and intuitive way is to state the Hypothesis System as follows:

H0: the Company claims that the decision of a drinker to say: natural of fake (I remember a classic example where an old English lady was sure to detect if in the cup of tea you poured milk ore tea first....and she guessed every time!) is like tossing a fair coin: Head for natural and Tail for fake.

in formula:

so, considering the diagram of the observed 10 size sample it is obvious that you reject the Statement of the Company if and only if the observed sample has a number of success >8 or <2, with a p-value <=5%

It is understood that this is only my opinion, and I am not a teacher but only an old guy.

Just a question: I am just registered here and I was not able to find a way to write the formulas in LaTeX or similar format. Can you help me?

thanks in advance

But I think that the most natural and intuitive way is to state the Hypothesis System as follows:

H0: the Company claims that the decision of a drinker to say: natural of fake (I remember a classic example where an old English lady was sure to detect if in the cup of tea you poured milk ore tea first....and she guessed every time!) is like tossing a fair coin: Head for natural and Tail for fake.

in formula:

so, considering the diagram of the observed 10 size sample it is obvious that you reject the Statement of the Company if and only if the observed sample has a number of success >8 or <2, with a p-value <=5%

It is understood that this is only my opinion, and I am not a teacher but only an old guy.

Just a question: I am just registered here and I was not able to find a way to write the formulas in LaTeX or similar format. Can you help me?

thanks in advance

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I am not quite convinced by an expected proportion of 50%, i.e. that

mere guessing is the correct model here. We need to include the

"natural" condition if we want to answer the question whether synthetic

coffee is more often experienced as tasting synthetic than natural coffee.

control group (natural coffee), and seemingly the "natural brand"

condition was indeed introduced just to lead the problem solvers

astray. Therefore you seem to be correct to consider this as a one-sample

problem.

With kind regards

Karabiner

We need to include the

"natural" condition if we want to answer the question whether synthetic

coffee is more often experienced as tasting synthetic than natural coffee.

"natural" condition if we want to answer the question whether synthetic

coffee is more often experienced as tasting synthetic than natural coffee.

control group (natural coffee), and seemingly the "natural brand"

condition was indeed introduced just to lead the problem solvers

astray.

I hope that the OP will understand how important is to write down the entire and original text....and show his effort to solve the problem

And, here is Dasons code for writing math tags.