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Question: Doctors and nurses Nurse-practitioners are nurses with advanced qualifications who often act much like primary-care physicians. Are they as effective as doctors at treating patients with chronic conditions? An experiment was conducted with 1316 patients who had been diagnosed with asthma, diabetes, or high blood pressure. Within each condition, patients were randomly assigned to either a doctor or a nurse-practitioner. The response variables included measures of the patients' health and of their satisfaction with their medical care after 6 months.
(a) Which are the blocks in this experiment: the different diagnoses (asthma, and so on) or the type of care (nurse or doctor)? Why?
(b) Explain why a randomized block design is preferable to a completely randomized design here.
Suppose that we wish to estimate the average daily pollution in Lake Erie. The daily yield, recorded for n = 50 days, produced a mean and standard deviation equal to y = 871 tons and s = 21 tons, respectively.
1.on a certain airline the chance the early flight from atlanta to chicago is full is 0.8. the chance the late flight
In a four-factor design based on portfolio size for welldiversified portfolios, with 240 data points, the F statistic was significant at the 1% level of significance. Explain.
Suppose that there are 63 boys assigned to the new drug group and 58 boys assigned to the placebo. Is there a statistically significant difference in the proportions of boys assigned to the treatments? Run the appropriate test at a 5% level of sig..
The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean?
You are working again with your project management e-group, and members are eager to learn how things are faring with your project. Others of the group are at an evaluative stage of their respective projects too, so you will read of their work as ..
Suppose the population proportion is 0.60. If the sample size is equal to 20, what is the sampling distribution of the sample proportion, 'p-hat'?
For the samples summarized below, test the hypothesis at ∞ =.05 that the two variances are equal. Variance Number of data values Sample 1 19 8 Sample 2 9 18
question laparoscopic surgery is a procedure for threading a small flexible tube within a patients body to explore or
Suppose a random sample of n = 15 observations is selected from a population that has normal distribution with mean 50 and standard deviation 10.
A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see that group has better grades.
Sick days. During contract negotiations, a company seeks to change the number of sick days employees may take, saying that the annual "average" is 7 days.
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