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A 13-foot ladder is leaning against a wall. If the top of the ladder slips down the wall at a rate of 2 ft/s, how fast will the foot be moving away from the wall when the top is 5 ft above the ground?
Sampling. A sample is chosen randomly from a popu- lation that can be described by a Normal model. What's the sampling distribution model for the sample mean? Describe shape, center, and spread.
Assuming that there is no cost to enter the .sweepstakes, find the expected value of the amount won for one entry. Round to the nearest tenth.
consider a random sample from a poission ditribution xipoiu.a show that yne-xnbarconverges stochastically to px0e-u.b
Explain why you think the conclusion is not justified. Describe the types of bias that may be present.- Reword the question in a way that you think might create a more positive response.
Use the least total cost lot-sizing method to determine when and for what quantity the first order should be released.
Previous information suggests that the percentage nonconforming is approximately 4%. How large a sample must be chosen?
The data found in http://www.wiley.comicollegthshenfelter contains information from the year-2000 Professional Golfers' Association tour.
Refer to the data on weights of 44 college students given in Exercise. Create a dotplot of all 44 weights. Then create stacked dotplots for the weights of male.
Suppose you have fit a linear model to some data and now take a look at the residuals. For each of the following possible residuals plots, tell whether you would try a re-expression and, if so, why.
How much do typical employee and his or her family spends per year on dental expenses? Sample of 45 employee reveals mean amount spend last year was $1,820, with standard deviation of $ 660.
What is the probability X is exactly 5? - What is the probability that X is no more than 10?- What is the probability that X is at least 20?
Based on your results in part (a), is it sensible to examine and interpret the main effects of drug and of dose?
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