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The operator of a metropolitan sewer system wishes to have a sum of $200,000 accumulated 25 years from now for an expected major rehabilitation at that time. The owner plans to invest $2000 per year into this special fund, starting December 2012. What critical annual interest rate must the owner's investment earn?
Suppose the waiting time at a restaurant is normally distributed with a mean of 12 minutes and a standard deviation of 6 minutes.
The New York Times recently reported that 60% of college entrants into elite public and private colleges in the U.S. have parents that earn over $150,000/yr.
A quality inspector is interested in the time spent replacing defective parts in one of the company's products. The average time spent should be at most 20 minutes per day according to company standards.
a group of investors wants to develop a chain of fast-food restaurants. in determining potential costs for each
Find the minimum sample size needed, using a prior study that found that 35% of the respondents said they used an online service or the Internet to make travel reservations.
The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 10 minutes.
To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
Net sales of the Kaiser Aluminum and Chemical Corporation for the period beginning in 1975 and ending in 1984 were:
several statistical tests have a way to measure effect size. what is this and when might you want to use it in looking
let x be a discrete random variable with possible values x ?1012 and probability function fx kx3 0.15 for x ?1012.a
Calculate η 2 , the percentage of variance accounted for by treatment.
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
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