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When do creative people get their best ideas? USA Today did a survey of 966 inventors...

When do creative people get their best ideas? USA Today did a survey of 966 inventors (who hold U.S. patents) and obtained the following information.

Time of Day When Best Ideas Occur
Time Number of Inventors
6 A.M.-12 noon
12 noon-6 P.M.
6 P.M.-12 midnight
12 midnight-6 A.M.		 278
145
336
207

(a) Assuming that the time interval includes the left limit and all the times up to but not including the right limit, estimate the probability that an inventor has a best idea during each time interval: from 6 A.M. to 12 noon, from 12 noon to 6 P.M., from 6 P.M. to 12 midnight, from 12 midnight to 6 A.M. (Enter your answers to 3 decimal places.)

6AM-12PM 12PM-6PM 6PM-12AM 12AM-6AM


(b) Do the probabilities add up to 1? Why should they?

No, because they do not cover the entire sample space.Yes, because they cover the entire sample space.    Yes, because they do not cover the entire sample space.No, because they cover the entire sample space.


What is the sample space in this problem?

12AM-12PM6AM-6PM    6AM-12AMthe entire day

math   Statistics-And-Probability   
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Answer #1

solution: Total observations = 966 P(x) = mle m (s) 19 Time 6-12 12-6 6-12 12-6 P(x) [0.288 0.288 10,150 10.3.48 [0.219 (6) E

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