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Real estate survey. A real estate agent looks over the 15 listings she has in a particular zip code in California and finds that 80% of them have swimming pools.
a) Check the assumptions and conditions for inference on proportions.
b) If it's appropriate, find a 90% confidence interval for the proportion of houses in this zip code that have swimming pools. If it's not appropriate, explain and/or recommend an alternative action.
After time min{Vn, Wn}, where {Wn, n ≥ 1} is a sequence of independent, Exp(θ)-distributed random variables, θ > 0, which is indepen- dent of {Vn, n ≥ 1}. Show that the replacement process is a Poisson process and determine the intensity.
If a random sample of 40 customers is taken, what is the probability that the sample average expenditure per customer for this sample will be 87.00 or more?
ten measurements of flow through a pipe are taken over time using a flow meter with a digital output. the flow meter
Which trend model is best, and why? If none is satisfactory, explain. (e) Make a forecast for 2003, using a trend model of your choice or a judgment forecast.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
a recent survey reported that 38 of all students in grades 9 through 12 participate in team sports run by organizations
Show the sampling distribution of the mean amount of Medicare spending for a sample of fifty 2003 enrollees. What is the probability the sample mean will be within, plus or minus, $300 of the population mean?
a turbine blade has demonstrated a weibull failure pattern with a decreasing failure rate characterized by a shape
A soft drink bottling machine is set to dispense soft drink into containers labeled 16 ounces. While the actual quantities vary they are normally distributed with a mean of 16.1 ounces and a standard deviation of 0.015 ounces.
a magazine published a study on the ammonia levels near the exit ramp of a highway tunnel. daily ammonia concentrations
How closely is the height of an individual related to the weight? Partial regression output for a sample of 92 individuals is below.
If the manufacturer guarantees the tread life of the tires for the first 53,520 miles, what proportion of the tires will need to be replaced under warranty?
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