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When supermarket customers are offered free samples,they take them 60% of the time. When 317 customers are observed, what is the probability that more than 180 will take a sample?
So construct a multiple regression model for predicting the crime rate based upon various explanatory variables unemployment rate, median income, education level.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
A researcher conducts a study of perceptual illusions under two different lighting conditions. Twenty participants were each tested under both of the two different conditions.
The diameters of a wooden dowel produced by a new machine are normally distributed with a mean of 0.55 inches and a standard deviation of 0.01 inches. What percent of the dowels will have a diameter less than 0.57?
If a random sample of 8 adults is selected from the city, find the probability that exactly 3 adults respond that they enjoy using public transportation.
The results for college x was a mean of 5 hours and an estimated population variance of 2 hours: for college y, m= 4, s 2 =1.5; and for college Z, M= 6, s 2 =2.5 what should you conclude? Use the .5 level.
The amount of money spent by a customer is uniformly distributed over (0,100). Find the mean and variance of the amount of money that the store takes on a given day.
I work in Aerospace Engineering. Aerospace components are often subjected to cyclic loads and can fail in "fatigue". The designers design the parts against fatigue failures using the "fatigue life" of the materials, typically obtained by testing the ..
With a population standard deviation of 15. Use the 95% confidence interval. Approximately how many Kleenexes should go in the automobile glove compartment boxes?
Is it sensible to conclude that mean weekly salary of school teachers is lower at .05 level of significance? Explain why?
the random variable x is normally distributed with meannbspmu and variancenbspsigmasquared. given that px gt 58.37
Give the expected value and standard deviation of defective shoes in the ShoeFit store order.
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