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Get the data on fragments of glass collected in forensic work from the book website. Estimate the density of the ?rst variable (refractive in- dex) using a histogram and use a kernel density estimator. Use cross- validation to choose the amount of smoothing. Experiment with di?erent binwidths and bandwidths. Comment on the similarities and di?erences. Construct 95 percent con?dence bands for your estimators.
The true proportion of all current B of A customers who would respond with a 9 or 10. Are we 95 % confident that this proportion exceeds .48 the historical proportion of customer delight for B of A?
Random sample of 250 americans is selected, the mean of this sample belongs to a sampling distribution. What is the shape of this sampling distribution?
Assume it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately normal with mean $25 and standard deviation $8.
Adele Weiss manages the campus flower shop. Flowers must be ordered three days in advance from her supplier in Mexico. Advance sales are so small that Weiss has no way to estimate the demand for the red roses.
Conduct a statistical test to determine if the sample is representative of the population.
The sample was collected by interviewers going to people's homes in randomly chosen areas in each of the 9 countries. The population represented by this sample was:
Suppose that 98% of the customers in your market have Internet access, and you select a random sample of 500 customers. What is the probability that the sample has:
What is the price of an extra dollar of c1 in terms of c2 and what is the equilibrium price? Output and profits of the low cost gold mine?
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
You want to know whether the population means are different in the two populations. Conduct an hypothesis test using an alpha of .05 and the critical value method.
The major shopping areas in community of Springdale include Springdale Mall, West Mall, and downtown area on Main Street. A telephone survey has been conducted to determine strengths and weaknesses of these areas and to find out how they fit in th..
a major chain of food stores wants to determine the proportion of customers who buy on impulse. the company decided to
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