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A mail order company is investigating the potential advantages of using a new heavy-duty packaging material. They shipped 1000 orders in the new packaging and another 1000 orders in the regular light packaging. Of the orders shipped in the regular packaging, 32 were damaged in shipment, and of orders shipped in the new packaging, only 15 were damaged in shipment. Find a 95% confidence interval for the difference between the proportions of damaged shipments.
Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other two years are each given a weight of 1.
A research team conducted a study of soft-drink preferences among residents in a test market prior to an advertising campaign for a new cola product.
For 1989 and 1990 Dave Johnson had the highest decathlon score in the world. When Johnson reached a speed of 32 ft/sec on the pole vault runway, his height above the ground t seconds after leaving the ground was given by h= -16t^2+32t.
Find out the probability distribution of your net winnings if you play one time. Calculate the mean and the standard deviation.
What are the key conceptual differences between these 3 methods? In other words, under what conditions do we choose each method for our analysis, and why?
Probability values based on normal distribution - old exit exam followed a normal distribution
using the data below generate a 95 confidence interval for the difference in proportions of women delivering preterm in
Based off the three requirements that must be met before an analysis of variance test (ANOVA) can be used: Samples must be randomly selected from the populations to be evaluated.
What is the largest possible value of the covariance? Remember that r can be positive or negative and what is the covariance between X and Y
a study looked at the relationship between condom use and the spread of aids by following heterosexual couples in which
Body mass index is measured as the ratio of weight in kilograms to height in meters squared. Are there outliers in the distribution of BMI (justify your answer)?
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
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