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A large medical professional organization with membership consisting of doctors, nurses, and other medical employees wanted to know how its members felt about HMOs (health maintenance organizations). Name the type of sampling plan they used in each of the following scenarios:
a. They randomly selected 500 members from each of the lists of all doctors, all nurses, and all other employees and surveyed those 1500 members.
b. They randomly selected ten cities from all cities in which the members lived, and then surveyed all members in those cities.
c. They randomly chose a starting point from the first 50 names in an alphabetical list of members, and then chose every 50th member in the list starting at that point.
assume that a procedure yields a binomial distribution with a trial repeated n times. use a binomial probabilities
Suppose that the value of p81 increases by 10% while all other mortality rates remain unchanged. What is the new present value of the contract?
Using your own experience, estimate the probability the local weather forecast is correct. Explain the rationale behind your estimate.
Suppose we are testing if the true mean amount of gas sold on a day is less than 900 gallons, at a 5% level of significance, the value of z* would be?
Imagine that you collect bottles of wine as a hobby. How would you react to these situations?
Identify and interpret the p-value for the test, then construct and interpret the 90% confidence interval for the difference between the population proportions.
In a sample of 49 adolescents who served as the subjects in an immunologic study, one variable of interest was the diameter of skin test reaction to an antigen.
What is the geometric mean annual increase for the period?
Percentage who say "Yes" from 7% to 3.5%? Explain to someone who knows no statistics the advantage of taking a larger sample in a survey of opinion.
almost all medical schools in the united states require applicants to take the medical college admission test mcat. on
a fair coin is tossed four times. what is the probability that the number of heads appearing on the first two tosses es
a) Construct a double stem-and-leaf diagram for these data. b) Find the sample mean, sample median, and sample standard deviation for these data.
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