Miss Marple loves tea with milk. She claims that she can taste, blindfolded, whether the tea or the milk was poured in first.  In a trial of 9 cups of tea with milk, how many times does she have to get it right (at least) so that the p-value is under 10% ? Your null hypothesis here is that she does not have a special skill, she is just guessing, so her success probability is p = 0.5.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Miss Marple loves tea with milk. She claims that she can taste, blindfolded, whether the tea or the milk was poured in first. 
In a trial of 9 cups of tea with milk, how many times does she have to get it right (at least) so that the p-value is under 10% ? Your null hypothesis here is that she does not have a special skill, she is just guessing, so her success probability is p = 0.5. 

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