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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.
for the most recent year available the mean annual cost to attend a private university in the united states was 20082.
What is the probability that next years annual maximum negative return exceeds all previous negative returns? In other words, what is the probability that next years maximum negative return is a new record?
Collapse the response categories in the following table so that it meets the assumption of the chi-square test; then perform the test.
a survey of affluent americans those with incomes of 75000 or more indicated that 56 would rather have more time than
Suppose that you are interested in determining the effectiveness of an intensive supervision program (ISP) for poor student performers. To examine its effectiveness, you keep track of 12 students entering an ISP for one year and tabulate the numbe..
a sample of size 100 has a sample standard deviation of 25. what is the standard error of the sample mean? give your
You have received your MBA from Trinity University and been hired by Deutsche Bank as the Executive Vice President of Finance.
a random sample of size 100 is to be taken from a population that has a proportion equal to 0.35. the sample proportion
use the one-proportion z-interval procedure to find the required confidence interval. be sure to check the conditions
A school administrator randomly selects 12 classes from your school and then selects all of the students of those classes to study a school library issue. Which type of sampling design is being used.
Can we conclude a difference in means? YES or NO (circle one)
1.a manufacturer receives parts from two suppliers. an srs of 400 parts from supplier 1 finds 20 defective. an srs of
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