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The chemical composition of soil varies with depth. The article "Sampling Soil Water in Sandy Soils: Comparative Analysis of Some Common Methods" (M. Ahmed, M. Sharma, et al.,Communications in Soil Science and Plant Analysis, 2001: 1677-1686) describes chemical analyses of soil taken from a farm in western Australia. Fifty specimens were taken at each of the depths 50 and 250 cm. At a depth of 50 cm(sample 2), the average NO3 concentration (in mg/L) was 88.5 with a standard deviation of 49.4. At a depth of 250 cm(sample 1), the average concentration was 110.6 with a standard deviation of 51.5. Find a 95% two-sided confidence interval for the difference between the NO3concentrations at the two depths.
A company has been using the same advertising strategy for a number of years and over that time has had relatively constant monthly sales.
Bob throws six dice and wins if he scores at least one ace. Alice throws 12 dice and wins if she scores at least two aces. Who has the greater probability of winning?
Determine the test sequence that minimizes the total expected cost of testing an item. Prove that your proposed sequence is optimal in minimizing the total expected cost of testing an item.
if the test statistic for a difference of means test has a p-value of .03 we could reject the null hypothesis at an
Go to the section on currencies within the website. First, identify the direct exchange rates of foreign currencies from the U.S. perspective. Then, identify the indirect exchange rates. What is the direct exchange rate of the euro?
a medical treatment has a success rate of 0.8. two patients will be treated with this treatment. assuming the results
can you reject the auto maker's claim that the mean gas mileage of its sports utility vehicle is 20 miles per gallon? Assume the population is normally distributed.
The two cars drove a combined total of 1450 miles, and the sum of their fuel efficiencies was 40 miles per gallon. What were the fuel efficiencies of each of the cars that week?
Prove that the product of functions with the monotone likelihood ratio property also has the multivariate monotone likelihood ratio property.
you are planning on junking your old car after it runs an additional 30000 km. the battery on this car has just failed
A retail federation conducted a nationwide survey of 1000 adults last October and found that approximately 55% of the respondents planned to do some type of Halloween decorating.
A professor wants to conduct a study to know whether the grades she gives to her students affect their evaluations of her. She teaches four classes of ten students each.
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