Stats help with binomial probability distribution question

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One more time...sorry for all the confusion:

Question: Mc'D's has 95% recognition rate. Sample is 15 individuals. Unlikely that <13 out of 15 don't recognize.

a) show we can use a binom prob dist if a success is recognition by someone

b) find prob of 13 or more people recognizing brand - am i using (n,p,x) multiple times for 13,14,15? would it be (.867, .933, and 1 for p? what about x - 13, 14, 15?)

c) is it unsual/unlikely if <13 people (at most 12) recognized it? why/why not?

Oct 15th, 2015

Thank you for the opportunity to help you with your question!

can you remove confusion so i can help u


Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 15th, 2015

Yes, thank you. Here is the question:

The brand name of McDonald's has a 95% recognition rate. A McDonald's executive wishes to see this result for herself by testing it on a group of 15 individuals. She surmises that it would be extremely unlikely if any less than 13 out of the 15 individuals do not recognize the brand.

A) Show that we can use a binomial probability distribution if we assume that a success is someone recognizing the brand. (This I believe I understand - just need to state that it adheres to the 4 rules.)

B) Find the probability of having 13 or more people recognize the brand.

C) Would you consider it unusual/unlikely if less than 13 people (at most 12) recognized the brand? Why or why not?

**Our professor doesn't want us to write out the formulas and do it longform.

So, in class we have been using the n,p,x formula (binompdf in the DISTR menu) on our calculators where n= the number of trials, p= probability of a succcess for an individual event, and x= number of desired successes

Thank you!

Oct 15th, 2015
binom.jpg

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Oct 15th, 2015
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