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Suppose you wish to estimate the difference between the mean acidity for rainfalls at two different locations, one in a relatively unpolluted area and the other in an area subject to heavy air pollution. If you wish your estimate to be correct to the nearest 0.2 pH, with probability near 0.90, approximately how many rainfalls (pH values) would have to be included in each sample? (Assume that the variance of the pH measurements is approximately 0.2 at both locations and that the samples will be of equal size. Round your answer up to the nearest whole number.)
Manufacturer of mole and gopher poison has experienced the following monthly demand for an environmentally sound pesticide poison. Using a Average method, what would the forecast have been for July?
attempting to analyze the relationship between advertising and sales the owner of a furniture store recorded the
If five of the recommended stocks will increase in value over the next year, determine the probability that at least half of the stocks selected by the client will increase in value over the next year. Explain.
a random and indepently chosen sample of four bags of marbles each labeled 20 pounds had weights of 20.5 19.8 20.8 and
q1. determine the appropriate approach to conduct a hypothesis test for this claim fewer than 5 of patients experience
The New York City Housing and Vacancy Survey showed a total of 59,324 rent-controlled housing units and 236,263 rent-stabilized units built in 194 or later.
a shipment of 20 tv tubes contains 16 good tubes and 4 defective tubes. three tubes are chosen successively and at
A sample of 45 students enrolled in the university indicates that X (bar) = $285.4 and s = $42.20. Using the 0.05 level of significance, is there evidence that the population mean is above $300?
In the belief that Statistics is too hard, a student claims that the mean score on a final exam is less then 70. 15 scores will be chosen at random to test this claim.
Estimate the mean number of cars per household for the population of households in the neighborhood. Give the 95% confidence interval.
Indicate which would be the independent variable and which would be the dependent variable in each of the following:
What is the optimal solution if the annual return for U.S. Oil changes from $3 to $8 per share (everything else stays the same)? What is the value of the total return?
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