A rondom Variable x takes value X; with Robabilty Pi, with (= 1,... N labelling all possibilities. The meats value of x is given, I cl N X = = = = = = Pixi i=1
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Q: What are the elements of a construct that can be measured or quantifhed?
A: the elements of a construct that can be measured or quantified
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- If Y has a binomial distribution with n trials and a probability of success p, show that the functiongenerator of moments for Y is: m(t) = (pe' +q)n with q = 1− pSuppose a certain species of fawns between 1 and 5 months old have a bodyweight that isapproximately normally distributed with mean μ = 30 kilograms and standard deviation σ = 4kilograms. Let x be the weight of a fawn in kilograms. Convert the following x interval to a zinterval. Round to the nearest hundredth. .x < 44.0 Group of answer choices z < –18.50 z < 3.50 z > –18.50 z < 18.50 z > 3.50Suppose that X has a lognormal distribution with parameters θ = 5 and ω2 = 9. Determine the following: a. P(X < 13,300)b. Value for x such that P(X ≤ x) = 0.95c. Mean and variance of X
- A machine in a production line fills packets of rice that are labelled as containing 5kg. The actual weights of the bags of rice is modelled by the distribution X~(μ,σ^2). When working as it should, the machine produces packets of rice with mean weight 5.05kg ( i.e. μ = 5.05). 95% of all packets have weights between 5kg and 5.1kg. The manager of the packaging plant suspects that the machine is no longer working as it should and that the mean weight of a packet is no longer 5.05kg. A sample of 10 packets is selected at random. The packets have the following weights: 5.063kg, 5.088kg, 5.077kg, 5.078kg, 5.104kg, 5.028kg, 5.050kg, 5.057kg, 5.032kg, 5.015kg Complete this hypothesis test at the 1% significance level to see if the machine is no longer performing as it should.Suppose that the speed at which cars go on the freeway is normally distributed with mean 80 mph and standard deviation 8 miles per hour. Let X be the speed for a randomly selected car. Round all answers to 4 decimal places where possible. d. 74% of all cars travel at least how fast on the freeway? ____ mph.Suppose that at a gas station the daily demand for regular gasoline is normally distributed with a mean of 1000 gallons and a standard deviation of 100 gallons. The station manager has just opened the station for business and there is exactly 2300 gallons of regular gasoline in storage. The next delivery is scheduled later tomorrow at the close of business. (a) Let X1 and X2 denote the demand of today and tomorrow, respectively. Let X = X1 + X2. Find the distribution of X. (b) Find the probability that the manager will have enough regular gasoline to satisfy today’s and tomorrow’s demand.
- If X1, X2, ... , Xk have the multinomial distribution of Definition 8, show that the mean of the marginal distribu-tion of Xi is nθi for i = 1, 2, ... , k.The U.S. divorce rate has been reported as 3.6 divorces per 1000 population. Assuming that this rate applies to a small community of just 500 people and is Poisson distributed, and that x = the number of divorces in this community during the coming year, determine the following: a. E(x) b. P(x=1) c. P(x= 4) d. P(x6) e. P(2x5)An industrial sewing machine uses ball bearings that are targeted to have a diameter of 0.75 inch. The lower and upper specification limits under which the ball bearings can operate are 0.73 inch and 0.77 inch, respectively. Past experience has indicated that the actual diameter of the ball bearings is approximately normally distributed, with a mean of 0.754 inch and a standard deviation of 0.005 inch. Type calculations and/or use Excel functions, including the explicit arguments for each function, in answering these questions. a) What proportion of the ball bearings produced meet the design requirements? b) Of 1000 bearings , how many are expected to be too large to function in the sewing machine? c) What diameter represents the 80th percentile of the bearings produced by this machine?
- Show that if ν > 2, the chi-square distribution has arelative maximum at x = ν − 2. What happens whenν = 2 or 0 <ν< 2?Suppose the lengths of human pregnancies are normally distributed with u = 266 days and 0 = 16 days. The area to the left of X = 245 is 0.0947. What is the probability that a randomly selected human pregnancy lastsAssume that the readings at freezing on a bundle of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested.If 4.1% of the thermometers are rejected because they have readings that are too high and another 4.1% are rejected because they have readings that are too low, find the two readings that are cutoff values separating the rejected thermometers from the others.interval of acceptable thermometer readings = _________ °C