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Suppose you work for a pharmaceutical company that is testing a new drug to treat ulcerative colitis. You conduct a random sample of 32 patients on the new drug and 14 of them indicated a decrease in symptoms since starting the drug regimen. You construct a 99% confidence interval for this proportion to be ( 0.2112 , 0.6638 ). What is the correct interpretation of this confidence interval?
1) We are 99% confident that the proportion of patients surveyed that have experienced a reduction in symptoms is between 0.2112 and 0.6638.
2) We are certain that 99% of patients will be between 0.2112 and 0.6638.
3) We cannot determine the proper interpretation of this interval.
4) We are 99% confident that the proportion of all patients on the drug regimen that have experienced a reduction in symptoms is between 0.2112 and 0.6638.
Find out the mean number of letters that will arrive in two days.
Pilot sample of n = 50 tires illustrated sample standard deviation equal to 4,000 miles. Based on this information, required sample size is?
the probability that a household is both prosperous and educated is P (A and B) = 0.082. What is the probability P (A or B) that the household selected is either prosperous or educated.
Enter relative proportions of the 3 samples in order (20,50,30) in "Expected values" area.
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Increasing the confidence-interval level from .95 to .99
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Estimating the value of the population mean on the basis of the sample mean alone produces a(n):
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study so that the two factors are smoking level and gender.
She has a history of being successful at getting a donor on 55 percent of her calls. If June has a quota to get at least four donors each day.
Not take SRS of 25 students who took test. What are the mean and standard deviation of sample mean score xbar of these 25 students?
Which of the following would have a binomial distribution and evaluate the binomial coefficient
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