A usability engineer claims that in usability experiments there is a 59% chance

Question

A usability engineer claims that in usability experiments there is a 59% chance (or a probability value of 0.59) that a user tester discovers a minor usability problem of a certain product. Suppose the usability engineer wants to conduct a usability study to evaluate the quality of a new computer interface, and recruits 5 user testers. Compute the following probabilities: a) What is the probability that all 5 user testers will find a minor problem with the interface? b) What is the probability that at least one user out of the 5 user testers will find a minor problem? A usability engineer claims that in usability experiments there is a 59% chance (or a probability value of 0.59) that a user tester discovers a minor usability problem of a certain product. Suppose the usability engineer wants to conduct a usability study to evaluate the quality of a new computer interface, and recruits 5 user testers. Compute the following probabilities: a) What is the probability that all 5 user testers will find a minor problem with the interface? b) What is the probability that at least one user out of the 5 user testers will find a minor problem? A usability engineer claims that in usability experiments there is a 59% chance (or a probability value of 0.59) that a user tester discovers a minor usability problem of a certain product. Suppose the usability engineer wants to conduct a usability study to evaluate the quality of a new computer interface, and recruits 5 user testers. Compute the following probabilities: a) What is the probability that all 5 user testers will find a minor problem with the interface? b) What is the probability that at least one user out of the 5 user testers will find a minor problem?

Explanation / Answer

Solution:-

a) P(all getting 5 user testers) = 0.59^5 = 0.0715 = 7.15%

b) P(at least one user of 5 testers) = (1-0.59)^5 = 0.0116 = 1.16%

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