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A city near a government weapons clean-up site is concerned about the level of radioactive byproducts in their water supply. The EPA limit on naturally occurring radiation is 5 picocuries per liter of water. A random sample of 26 water specimens from the city water supply gives y = 4.82 and s = 0.79. Does this provide sufficient evidence that the water supply is safe (i.e., below the maximum level allowed)? Test, using a = 0.01, and explain what your results mean.
1. define in your words nominal ordinal and interval-ratio levels of measurement. provide 3 examples for each level of
Find the expected value and variance of S = X + Y + Z and find the expected value and variance of A = (1/3)(X + Y + Z).
A machine produces parts with lengths that are normally distributed with ? = 0.59. A sample of 19 parts has a mean length of 76.26.
How many 60-year old females on average will be living at age 61 and how many 70-year old males on average will be living at age 71?
Where you are calculating the value of uncertain outcomes (probability nodes on the diagram), do this by multiplying the value of the outcomes by their probability. The total for that node of the tree is the total of these values.
a simple random sample for five executives who went on a diet on their doctors order report the following numbers of
The following are the percentages of ash content in 12 samples of coal found in close proximity:9.2, 14.1, 9.8, 12.4, 16.0, 12.6, 22.7, 18.9, 21.0, 14.5, 20.4, 16.9- Find the sample mean
the drying time of a certain type of paint under specified test conditions is known to have mean value 75 minutes.
An artifact is discovered at a certain site. If it has 46% of the carbon-14 it originally contained, what is the approximate age of the artifact to the nearest year?
I. What is the population? II. What is the sample? III. Is the study observational or experimental? Justify your answer. IV. If observational, identify ALL variables. If experimental, identify ALL independent and dependent variables.
Construct a scatter plot and calculate the slope and intercept in this problem
given the probability that james will go the gym after work is 28 and the probability that sam will go the gym after
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