AnswersConcepts in Probability and Statistics AProbability with Combinations and Permutations — Unit testQuestion 13
13
QuizMultiple Choice
Probability with Combinations and Permutations — Unit test
Question 13 of 25 • Concepts in Probability and Statistics A
An online news report claims that 50% of online news readers work in the business industry. To test this claim, a researcher takes an SRS of 25 online news readers. Nine of them work in the business industry. A simulation of 65 trials was conducted under the assumption that 50% of online news readers really do work in the business industry.
Answer
A
Since 0.36 of the sample works in the business industry, 0.36 is the true probability that an online news reader works in the business industry.B
It is most likely that, out of 25 online readers, between 12 and 13 work in the business industry.C
Because there appear to be outliers present that are greater than 16, we can conclude that more than 50% of online readers work in the business industry.D
There is about a 0.046 chance that 9 or fewer online readers work in the business industry. This is unusual and is convincing evidence that less than 50% of online readers work in the business industry.