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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 poll found that 329 out of 763 adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 92% confidence.
what is the maximum amount a decision maker would pay for additional
One flight daily to a certain destination. The following information shows the probability distribution of late arrivals for that flight in the past month:
A survey of 30 adults found that the mean age of a person's primary vehicle is 5.6 years. Assuming the standard deviation of the populaiton is 0.8 year, find the 99% confidence interval estimate for the population mean.
question the temperature in january is estimated to have a mean of 34 and a standard deviation of 6 in degrees
assume that a radiologist group practice has the following cost structurefixed costsnbspnbspnbspnbsp
1. define in your words nominal ordinal and interval-ratio levels of measurement. provide 3 examples for each level of
a major issue facing many states is whether to legalize casino gambling. suppose the governor of one state believes
What is the probability that a simple random sample of auto insurance policies will have a sample mean within $25 of the population mean for each of the following sample sizes: 30, 50, 100, and 400.
a laboratory is testing the concentration level in mgml for the active ingredient found in a pharmaceutical product. in
Sample data have been collected, and the null hypothesis to be tested is H0: "The sample was drawn from a normal population in which µ, 5 130." If the analy- sis is based on a categorization that includes 8 cells:
Do the six measurements present sufficient evidence to indicate that the average weight of the diamonds produced by the new process is in excess of 0.5 karat?
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