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One article describes measurements of ammonium concentrations (in mg/L) at a large number of wells in the state of Iowa. These included 349 alluvial wells and 143 quaternary wells. The concentrations at the alluvial wells averaged 0.27 with a standard deviation of 0.40, and those at the quaternary wells averaged 1.62 with a standard deviation of 1.70. Find a 95% confidence interval for the difference in mean concentrations between alluvial and quaternary wells
a fair 4 sided die has the numbers 123 and 4 on its faces. the die is rolled 20 times. the random variable x represents
investment analysts generally believe the interest rate on bonds is inversely related to the prime interest rate for
Find out the probability
A regression of attitude toward legalizing marijuana on age (X1) and education (X2) produced the following estimated coefficients and standard errors for a sample of 265 persons.
The objective is to maximize the expected net return. Define the optimal value function and give the optimality equation. Find the optimal policy.
What type of research design is the strongest when I what to adopt a new educational program? Using a pre-test and post-test with control group, the previous method but without the control group.
What is the probability that a single student, randomly chosen from those taking the ACT, scores 21 or higher? What is the probability that the mean score x of a SRS of 50 students is 21 or higher?
Find the power of the test designed to determine if the the new safety equipment is effective when the mean percent reduction is actually 2.3%. Assume that the population standard deviation is 12% and that α is 0.02. What is the power?
One of the intervals of interest is the interval 60 to 80. Based on the given information, what is the relative frequency for the interval 60 to 80 in this particular class?
Suppose that A makes a statement, and then D says that C says that B says that A was telling the truth. What is the probability that A was actually telling the truth?
Find out the earliest completion time for play and critical path.
To carry out a validation study, an I/O psychologist is developing a regression equation from data collected from those hired two years ago
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