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A vendor of seasonal items wants to purchase a number of Christmas trees for the upcoming season. Based on previous years' records, she estimates demand for Christmas trees at her shop to be a normally-distributed random variable with mean μ = 250 and standard deviation σ = 50. If the purchase price for a tree is po = €30 which she then sells at ps = €50, assuming she cannot recover any value at all from any unsold tree, what is the quantity of trees she should purchase in order to maximize her expected profits?
Using your result obtained in g, derive for each sample in your population of samples (cf., result obtained in d) a 90% confidence interval.
Explain the difference between multiple independent variables and multiple levels of independent variables. Which is better? What is blocking and how does it reduce "noise"?
the capacity bits of the largest dram dynamic random access memory chips commonly available at retail has increased as
Standard deviation of this poll is 4%. What would be standard deviation if sample size were increased from 83 to 190?
Suppose in fact that 47% of the population favors this idea. Use the normal distribution to calculate the probability that at least half of the sample are in favor.
How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.04 with 98% confidence?
Explanation on what is the logic behind using the sum of the products of deviation scores as the numerator of the formula for the correlation coefficient?
the cardboard bales produced at a local recycling depot have an average weight of 400kg with a standard deviation of
Develop the appropriate null and alternative hypotheses and what is the Type I error in this situation? What are the consequences of making this error?
coefficient of variation and standard deviation are two measures of dispersion or spread among the data values. lets
General Discrete Random Variable
How many of the 15 students would you expect to correctly identify Coke or Pepsi? What is the probability that exactly 10 students surveyed will correctly identify coke or Pepsi.
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