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Question: Seeds. A garden center wants to store leftover packets of vegetable seeds for sale the following spring, but the center is concerned that the seeds may not germinate at the same rate a year later. The manager finds a packet of last year's green bean seeds and plants them as a test. Although the packet claims a germination rate of 92%, only 171 of 200 test seeds sprout. Is this evidence that the seeds have lost viability during a year in storage? Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and conditions are satisfied before you proceed.
(a) If a randomly selected adult is is positive based on the test, what is the probability that the person has the disease? (b) Is this a good diagnostic test?
In general, approximately how many values must be altered to make the sample median arbitrarily large?
Suppose you have the experiment of flipping a coin three times.
In general, determine the standard score a measure of?
Perform exploratory data analysis on CreativityPre and CreativityPost. Using SPSS, calculate the mean and standard deviation of these two variables.
Explain clearly what is meant by a false negative rate of 5% and a false positive rate of 15%. If the population were screened, what proportion would be expected to test negative for metropathy?
Based on a P-value of 0.0248 the researchers concluded there was evidence that low birth weights may be a risk factor for susceptibility to depression. Explain in context what the reported P-value means.
Use the sign test to determine if the medicine has an effect on blood pressure. What is the p-value?
Suppose also that after selecting 15 members at random we obtained the following paired observations: Use these data to find the covariance between age and the number of visits.
First, please review the five-step outline for a decision-oriented measurement problem. Think about how you might address each step in a project at your work (or any other real-world application).
Describe Secretary of State John Quincy Adams's Address to Congress, July 4, 1821. As a statement of American Foreign Policy, what does it assert? Do you think it accurately reflects American Foreign Policy up to that time? Explain.
Construct a 95% confidence interval for the population mean number of shares traded per day in 2010. Interpret the confidence interval.
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