Consider the following time series data. 34 : Week 1 2 5 6 Value 18 14 15 12 18 14 Using the average of all the historical data as a forecast for the next period, compute the following. (Round your answers to two decimal places.) (a) mean absolute error MAE = (b) mean squared error MSE = (c) mean absolute percentage error МАРЕ - X % (d) What is the forecast for week 7?
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- Suppose that historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the previous six months, in a sample of 115 new car buyers, 46 have traded in their old car. To determine whether the proportion of new car buyers that trade in their old car has  statistically significantly decreased, what is the P value? (please round your answer to four decimal places)Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1500 hr and a standard deviation of 100 hr. If 90,000 of these bulbs are produced, how many will last between 1360 hr and 1620 hr?The operator of a pumping station has observed that demand for water during early afternoon hours has an approximately exponential distribution with mean 100 cfs (cubic feet per second).a) Find the probability that the demand will exceed 200 cfs during the early afternoon on arandomly selected day.b) What water-pumping capacity should the station maintain during early afternoons sothat the probability that demand will exceed capacity on a randomly selected day isonly .01?
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- By first calculating, and then combining, the number of counts in each individual 30- second period, what does student A determine as the average decay rate (in counts/sec), and what is its uncertainty?Is there a relationship between smoking and alcohol consumption? No Alcohol Low Alcohol Medium Alcohol High Alcohol Marginal Total Never Smokes 450 205 190 75 Smoker 425 255 170 30 Marginal Total Round each of the following to two decimal places: What is the expected frequency of people who never smoke and do not consume alcohol? What is the expected frequency of smokers who do not consume alcohol? What is the expected frequency of people who never smoke and consume high amounts of alcohol? What is the expected frequency of smokers who consume high amounts of alcohol?The operator of a pumping station has observed that demand for water during early afternoon hours has an approximately exponential distribution with mean 1000 cfs (cubic feet per second). a)Of the three randomly selected afternoons, what is the probability that on at least two afternoons the demand will exceed 700 cfs?
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