22.When do creative people get their best ideas? USA Today did a survey of 966 i
ID: 3129369 • Letter: 2
Question
22.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.
(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.)
12PM-6PM
(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-12PM
6AM-6PM
6AM-12AM
the entire day
Time of Day When Best Ideas Occur Time Number of Inventors 6 A.M.-12 noon12 noon-6 P.M.
6 P.M.-12 midnight
12 midnight-6 A.M. 271
123
327
245
Explanation / Answer
Total number of inventors = 271+123+327+245=966
(a) P(6AM-12PM) = 271 / 966 = 0281
P(12PM-6PM) = 123 / 966 =0.127
P(6PM-12AM) = 327 / 966 = 0.339
P(12AM-6AM) = 245 / 966 = 0.254
(b) No. because tey cover the entire sample space
(c) Correct Answer : Option (d)
Sample space is the entire day
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