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In an aerial survey of four plots selected by simple random sampling, the numbers of ducks detected were 44, 55, 4, and 16. Careful examination of photo imagery of the first and third of these plots (selected as a simple random subsample) revealed the actual presence of 56 and 6 ducks, respectively. The study area consists of 10 plots.
(a) Estimate the total number of ducks in the study area by using a ratio estimator. Estimate the variance of the estimator.
(b) Suppose that the photo analysis doubles the cost of observing a plot. Estimate the optimal subsampling fraction.
What examples of companies successfully or not-so-successfully implementing
you purchase a new motor vehicle and are considering purchasing an extended bumper-to-bumber warranty. the extended
Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
a high-volume printer produces minor print-quality errors on a test pattern of 1000 pages of text according to a
you plan to conduct a survey to find what proportion of the workforce has two or more jobs. you decide on the 99
suppose we watch the price of the dow jones industrial index for three days.assume there is a 6040 chance that the
Assume that waiting times are approximately normally distributed. Construct a 98% confidence interval for the population mean of waiting times.
A food inspector, examining 12 jars of a certain brand of peanut butter, obtained from the fofollowing percentages of impurities: 2.3, 1.9, 2.1, 2.8, 2.3, 3.6, 1.4, 1.8, 2.1, 3.2, 2.0 and 1.9.
data with 250 observations are drawn from a bell-shaped distribution with a mean of 50 and a standard deviation of 12.
Public health statistics indicate that about 26.4% of Americans smoke. Suppose a random sample of 50 people is selected. Approximate the distribution of the same proportion with the normal model.
Obtain a test statistic and p-value. Interpret the results at = .01.
q1. suppose the monthly percentage changes in the tse 300 index from 1980 to 2000 are normally distributed with a
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