Mathematics, 27.11.2019 07:31, StupidFatChipmunk
(a) a random sample of 10 houses in a particular area, each of which is heated with natural gas, is selected and the amount of gas (therms) used during the month of january is determined for each house. the resulting observations are 153, 103, 125, 149, 118, 109, 86, 122, 138, 99. let μ denote the average gas usage during january by all houses in this area. compute a point estimate of μ.therms(b) suppose there are 25,000 houses in this area that use natural gas for heating. let τ denote the total amount of gas used by all of these houses during january. estimate τ using the data of part (a).therms(c) use the data in part (a) to estimate p, the proportion of all houses that used at least 100 therms.(d) give a point estimate of the population median usage (the middle value in the population of all houses) based on the sample of part (a).therms
Answers: 2
Mathematics, 21.06.2019 18:30, zoeatlowapple
An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e. g. 98.7654). x f(x) 0 1 2 3
Answers: 2
Mathematics, 21.06.2019 21:30, amesha62
In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?
Answers: 1
(a) a random sample of 10 houses in a particular area, each of which is heated with natural gas, is...
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