11. Can pleasant aromas help a student learn better? Two researchers belleved th the presence of a floral scent could improve a person's learning ability in certa situations. They had twenty-two people work through a pencil and paper maze s times, three times while wearing a floral-scented mask and three times wearing a unscented mask. The three trials for each mask closely followed one anothe Testers measured the length of time it took subjects to complete each of the s trials. They reported that, on average, subjects wearing the floral-scented mas completed the maze more quickly than those wearing the unstented mask, althoug the difference was not statistically significant. This study is a. a convenience sample. b. an observational study, not an experiment. c. an experiment, but not a double blind experiment. d. a double blind experiment.

A rare genetic disease is known to be carried by DD people among 10000 people in the society. a) In a random sample of 1000 people, calculate the probability that less than GG carry the disease? (Please solve this section with Binomial distribution) a) In a random sample of 2000 people, calculate the probability that more than HH carry the disease? (Please solve this section with Poisson distribution) c) If people are randomly tested for the disease, what is the probability that the first person who is found to carry the disease is the LL person?

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