Mathematics, 18.10.2019 05:50, emurray
The wall street journal reported that approximately 25% of the people who are told a product is improved will believe that it is, in fact, improved. the remaining 75% believe that this is just hype (the same old thing with no real improvement). suppose a marketing study consists of a random sample of seven people who are given a sales talk about a new, improved product. (a) make a histogram showing the probability that r = 0 to 7 people believe the product is, in fact, improved. maple generated plot maple generated plot maple generated plot maple generated plot (b) compute the mean and standard deviation of this probability distribution. (round your answers to two decimal places.) μ = 1.225 incorrect: your answer is incorrect. people σ = 2 incorrect: your answer is incorrect. people (c) how many people are needed in the marketing study to be 99% sure that at least one person believes the product to be improved? (hint: note that p(r ≥ 1) = 0.99 is equivalent to 1 − p(0) = 0.99, or p(0) = 0.01.) people
Answers: 2
Mathematics, 21.06.2019 20:50, brea2006
An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.
Answers: 3
Mathematics, 21.06.2019 21:50, gwendallinesikes
Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x
Answers: 1
The wall street journal reported that approximately 25% of the people who are told a product is impr...
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