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Scientists at the Hopkins Memorial Forest in western Massachusetts have been collecting meteorological and environ- mental data in the forest data for more than 100 years. In the past few years, sulfate content in water samples from Birch Brook has averaged 7.48 mg/L with a standard deviation of 1.60 mg/L.
(a) What is the standard error of the sulfate in a collection of 10 water samples?
(b) If 10 students measure the sulfate in their samples, what is the probability that their average sulfate will be between 6.49 and 8.47 mg/L?
(c) What do you need to assume for the probability calculated in (b) to be accurate?
Choose the correct conclusion regarding the claim that the weights of statistics text vary more than the weights of text in general.
The probability that a person suffering from a migraine headache will obtain relief from a particular drug is 0.9. Three randomly selected sufferers from migraine headache are given the drug. Find the probability that the number obtaining relief w..
An independent financial advisor claims an average rate of return, μ, on a particular investment is at least 7%. In testing her claim, the correct pair of hypotheses is:
A recent survey of 50 executives who were laid off durning a recent recession revealed it took a mean of 26 weeks for them to find another position. The standard deviation of the sample was 6.2 weeks. Construct a 95 percent confidence interval for..
Do the data indicate that the distribution of preferences for older adults is significantly different from the distribution for college students? Test with .05.
A 'good' correlation is data-context driven. For example, I did a project correlating sales volume per state and customer demographics (pretty 'hard' data) and got a .92 correlation.
Calculate the limits within which the weight of the packets should lie assuming that the machine is not been classified as faulty.
Critically discuss the mean number of children per household for these families? Round your answer to at least one decimal place.
let x denote the number of times a certain numerical control machine will malfunction 1 2 or 3 times on any given day.
calculate the true minor and major strains and the engineering minor and major strains of a circle. the original
In addition, explain why it is important to ensure that your participants understand fully the extent of the research before you begin.
The Rathburn Manufacturing Company makes electric wiring, which it sells to contractors in the construction industry. Approximately 900 electric contractors purchase wire from Rathburn annually.
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