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Both surface soil and subsoil specimens were taken from eight randomly selected agricultural locations in a particular county. The soil specimens were analyzed to determine both surface pH and subsoil pH, with the results shown in the accompanying table.
a. Compute a 90% confidence interval for the mean difference between surface and subsoil pH for agricultural land in this county.
b. What assumptions are necessary for the interval in Part (a) to be valid?
A research firm has found that 39% of U.S. adults in the over-$75,000 income category work at least 51 hours per week.- For each of the confidence intervals, identify and explain the maximum likely error in the study.
Construct a frequency distribution for these data. Use the 2k n guideline to determine the number of classes to use.
A system is composed of three components operating independently. Two active components are sufficient for the system to function. Calculate the failure rate of the system if the lifetime Ti of component i has an exponential distribution with para..
Suppose a national polling agency conducted 100 polls in a year, using proper random sampling, and reported a 95% confidence interval for each poll.- About how many of those confidence intervals would we expect not to cover the true population valu..
Demonstrates clearly and fully the ability to use Excel to perform the correlation for the data set.
What criteria should be used when taking a student from one level to another? Which tests should be used to assess learning.
A random sample of 21 employees with increased benefits yielded the following number of days spent off the job in one year: 5, 17, 1, 0, 2, 3, 1, 1, 5, 2, 7, 5, 0, 3, 3, 4, 22, 2, 8, 0, 1. Conduct the appropriate test, and state your conclusions.
A marketing company performed a risk analysis for a manufacturer of synthetic fibers and concluded that new competitors present no risk 13% of the time, What is the range of the joint probability distribution of X, Y, and Z
The average playing time of compact discs in a large collection is 35 min, and the standard deviation is 5 min. What value is 1 standard deviation above the mean? 1 standard deviation below the mean? What values are 2 standard deviations away from ..
Prove that the given function satisfies all the properties required of joint CDFs and hence will always be a valid joint CDF.
You can estimate the sampling distribution of y mean (y with a - on top) by repeatedly taking samples of size n with replacement from the list of sample values.
The following data are the number of pages in 40 books on a shelf. Construct a box plot using a graphing calculator, and state the interquartile range.
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