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Question: Drinking-water quality study. Disasters (Vol. 28, 2004) published a study of the effects of a tropical cyclone on the quality of drinking water on a remote Pacific island. Water samples (size 500 milliliters) were collected approximately 4 weeks after Cyclone Ami hit the island. The following variables were recorded for each water sample. Identify each variable as quantitative or qualitative
(a) Town where sample was collected
(b) Type of water supply (river intake, stream, or borehole)
(c) Acidic level (pH scale, 1-14)
(d) Turbidity level (nephalometric turbidity units [NTUs])
(e) Temperature (degrees Centigrade)
(f) Number of fecal coliforms per 100 milliliters
(g) Free chlorine-residual (milligrams per liter)
(h) Presence of hydrogen sulphide (yes or no)
Your task is to interview a representative sample of attendees for the large concert venue where you work. The new season includes 200 live concerts featuring all types of musicians and musical groups.
Kerosene Purity - Is there any evidence to suggest that at least two of the population mean flash points are different?
The length of a Colorado brook trout is normally distributed. What is the probability that a brook trout's length:
To estimate p, we use the proportion p-hat in the sample who answer "Yes." Justify the use of a normal approximation and find the following probabilities.
The travel brochure states that walking up O'Connell Street, the statue of Parnell comes into view. Apparently that statue has no trouble getting around.
Go to the most recent Statistical Abstract (online at www.census.gov/ compendia/statab/) and look under "Population," "Households and Families,".
At the present time, the warehouse is 40 feet deep. How many feet of depth should be added on the warehouse to minimize the annual inventory costs?
the most common therapy for warts is cryotherapy in which liquid nitrogen is applied to the area of the wart every few
In order for a circuit board to work, seven identical chips must be in working order. To improve reliability, an additional chip is included in the board.
A box of 9 gloves contains two left handed gloves and seven right handed gloves. If two gloves are randomly selected from the box, without replacement, what is the probability that both gloves will be right handed?
Thirty randomly selected students took the calculus final. If the sample mean was 79 and the standard deviation was 8.5, construct a 99% confidence interval for the mean score of all students.
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
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